diff --git a/CHANGELOG.md b/CHANGELOG.md
index a38d934b9a..a7ec678a4c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## 5.28.3 (2022-11-16)
+
+### Bug fixes
+
+* Fixed a very rare race-condition in refreshSymbolTable that could lead to empty native stack traces being reported
+  [#1781](https://github.com/bugsnag/bugsnag-android/pull/1781)
+
 ## 5.28.2 (2022-11-08)
 
 ### Bug fixes
diff --git a/bugsnag-android-core/src/androidTest/java/com/bugsnag/android/DataCollectorTest.kt b/bugsnag-android-core/src/androidTest/java/com/bugsnag/android/DataCollectorTest.kt
index 524333c14f..443bf353c6 100644
--- a/bugsnag-android-core/src/androidTest/java/com/bugsnag/android/DataCollectorTest.kt
+++ b/bugsnag-android-core/src/androidTest/java/com/bugsnag/android/DataCollectorTest.kt
@@ -3,6 +3,7 @@ package com.bugsnag.android
 import android.content.Context
 import android.content.res.Configuration
 import android.content.res.Resources
+import com.bugsnag.android.internal.BackgroundTaskService
 import org.junit.Ignore
 import org.junit.Test
 import org.junit.runner.RunWith
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/Client.java b/bugsnag-android-core/src/main/java/com/bugsnag/android/Client.java
index bd532bc4d3..9f34ac3b41 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/Client.java
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/Client.java
@@ -2,11 +2,13 @@
 
 import static com.bugsnag.android.SeverityReason.REASON_HANDLED_EXCEPTION;
 
+import com.bugsnag.android.internal.BackgroundTaskService;
 import com.bugsnag.android.internal.ImmutableConfig;
 import com.bugsnag.android.internal.InternalMetrics;
 import com.bugsnag.android.internal.InternalMetricsImpl;
 import com.bugsnag.android.internal.InternalMetricsNoop;
 import com.bugsnag.android.internal.StateObserver;
+import com.bugsnag.android.internal.TaskType;
 import com.bugsnag.android.internal.dag.ConfigModule;
 import com.bugsnag.android.internal.dag.ContextModule;
 import com.bugsnag.android.internal.dag.SystemServiceModule;
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/DataCollectionModule.kt b/bugsnag-android-core/src/main/java/com/bugsnag/android/DataCollectionModule.kt
index 20bf61229c..70e9bd78f1 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/DataCollectionModule.kt
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/DataCollectionModule.kt
@@ -1,6 +1,7 @@
 package com.bugsnag.android
 
 import android.os.Environment
+import com.bugsnag.android.internal.BackgroundTaskService
 import com.bugsnag.android.internal.dag.ConfigModule
 import com.bugsnag.android.internal.dag.ContextModule
 import com.bugsnag.android.internal.dag.DependencyModule
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/DeliveryDelegate.java b/bugsnag-android-core/src/main/java/com/bugsnag/android/DeliveryDelegate.java
index 7e4d1b207b..5c4ef01616 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/DeliveryDelegate.java
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/DeliveryDelegate.java
@@ -2,7 +2,9 @@
 
 import static com.bugsnag.android.SeverityReason.REASON_PROMISE_REJECTION;
 
+import com.bugsnag.android.internal.BackgroundTaskService;
 import com.bugsnag.android.internal.ImmutableConfig;
+import com.bugsnag.android.internal.TaskType;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/DeviceDataCollector.kt b/bugsnag-android-core/src/main/java/com/bugsnag/android/DeviceDataCollector.kt
index ed3573f3fe..a7755a2edc 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/DeviceDataCollector.kt
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/DeviceDataCollector.kt
@@ -11,6 +11,8 @@ import android.content.res.Resources
 import android.os.BatteryManager
 import android.os.Build
 import android.provider.Settings
+import com.bugsnag.android.internal.BackgroundTaskService
+import com.bugsnag.android.internal.TaskType
 import java.io.File
 import java.util.Date
 import java.util.Locale
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/EventStorageModule.kt b/bugsnag-android-core/src/main/java/com/bugsnag/android/EventStorageModule.kt
index 03f01f0a3e..c0573d6a3e 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/EventStorageModule.kt
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/EventStorageModule.kt
@@ -1,5 +1,6 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.BackgroundTaskService
 import com.bugsnag.android.internal.dag.ConfigModule
 import com.bugsnag.android.internal.dag.ContextModule
 import com.bugsnag.android.internal.dag.DependencyModule
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/EventStore.java b/bugsnag-android-core/src/main/java/com/bugsnag/android/EventStore.java
index 593003ce99..6d1f1ab574 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/EventStore.java
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/EventStore.java
@@ -1,6 +1,8 @@
 package com.bugsnag.android;
 
+import com.bugsnag.android.internal.BackgroundTaskService;
 import com.bugsnag.android.internal.ImmutableConfig;
+import com.bugsnag.android.internal.TaskType;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/InternalReportDelegate.java b/bugsnag-android-core/src/main/java/com/bugsnag/android/InternalReportDelegate.java
index d4001aa3e5..0bf0d49a05 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/InternalReportDelegate.java
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/InternalReportDelegate.java
@@ -3,8 +3,10 @@
 import static com.bugsnag.android.DeliveryHeadersKt.HEADER_INTERNAL_ERROR;
 import static com.bugsnag.android.SeverityReason.REASON_UNHANDLED_EXCEPTION;
 
+import com.bugsnag.android.internal.BackgroundTaskService;
 import com.bugsnag.android.internal.ImmutableConfig;
 import com.bugsnag.android.internal.JsonHelper;
+import com.bugsnag.android.internal.TaskType;
 
 import android.annotation.SuppressLint;
 import android.content.Context;
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/LibraryLoader.java b/bugsnag-android-core/src/main/java/com/bugsnag/android/LibraryLoader.java
index 6d8f216b71..1a5e8caf77 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/LibraryLoader.java
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/LibraryLoader.java
@@ -1,5 +1,7 @@
 package com.bugsnag.android;
 
+import com.bugsnag.android.internal.TaskType;
+
 import java.util.concurrent.atomic.AtomicBoolean;
 
 class LibraryLoader {
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/Notifier.kt b/bugsnag-android-core/src/main/java/com/bugsnag/android/Notifier.kt
index 8341ec00b9..c8609a883f 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/Notifier.kt
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/Notifier.kt
@@ -7,7 +7,7 @@ import java.io.IOException
  */
 class Notifier @JvmOverloads constructor(
     var name: String = "Android Bugsnag Notifier",
-    var version: String = "5.28.2",
+    var version: String = "5.28.3",
     var url: String = "https://bugsnag.com"
 ) : JsonStream.Streamable {
 
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/SessionTracker.java b/bugsnag-android-core/src/main/java/com/bugsnag/android/SessionTracker.java
index ddb2f052d5..f31154f1fd 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/SessionTracker.java
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/SessionTracker.java
@@ -1,7 +1,9 @@
 package com.bugsnag.android;
 
+import com.bugsnag.android.internal.BackgroundTaskService;
 import com.bugsnag.android.internal.DateUtils;
 import com.bugsnag.android.internal.ImmutableConfig;
+import com.bugsnag.android.internal.TaskType;
 
 import android.os.SystemClock;
 
@@ -18,7 +20,6 @@
 import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.atomic.AtomicLong;
-import java.util.concurrent.atomic.AtomicReference;
 
 class SessionTracker extends BaseObservable {
 
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/TrackerModule.kt b/bugsnag-android-core/src/main/java/com/bugsnag/android/TrackerModule.kt
index a293539f28..ae1db31f2a 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/TrackerModule.kt
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/TrackerModule.kt
@@ -1,5 +1,6 @@
 package com.bugsnag.android
 
+import com.bugsnag.android.internal.BackgroundTaskService
 import com.bugsnag.android.internal.dag.ConfigModule
 import com.bugsnag.android.internal.dag.DependencyModule
 
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/BackgroundTaskService.kt b/bugsnag-android-core/src/main/java/com/bugsnag/android/internal/BackgroundTaskService.kt
similarity index 98%
rename from bugsnag-android-core/src/main/java/com/bugsnag/android/BackgroundTaskService.kt
rename to bugsnag-android-core/src/main/java/com/bugsnag/android/internal/BackgroundTaskService.kt
index 76a92312a6..ef3394fd52 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/BackgroundTaskService.kt
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/internal/BackgroundTaskService.kt
@@ -1,4 +1,4 @@
-package com.bugsnag.android
+package com.bugsnag.android.internal
 
 import androidx.annotation.VisibleForTesting
 import java.util.concurrent.BlockingQueue
@@ -18,7 +18,7 @@ import java.lang.Thread as JThread
  * The type of task which is being submitted. This determines which execution queue
  * the task will be added to.
  */
-internal enum class TaskType {
+enum class TaskType {
 
     /**
      * A task that sends an error request. Any filesystem operations
@@ -91,7 +91,7 @@ internal fun createExecutor(name: String, type: TaskType, keepAlive: Boolean): E
  * It also avoids short-running operations being held up by long-running operations submitted
  * to the same executor.
  */
-internal class BackgroundTaskService(
+class BackgroundTaskService(
     // these executors must remain single-threaded - the SDK makes assumptions
     // about synchronization based on this.
     @get:VisibleForTesting
diff --git a/bugsnag-android-core/src/main/java/com/bugsnag/android/internal/dag/DependencyModule.kt b/bugsnag-android-core/src/main/java/com/bugsnag/android/internal/dag/DependencyModule.kt
index f766b0dd2c..731e5adfc5 100644
--- a/bugsnag-android-core/src/main/java/com/bugsnag/android/internal/dag/DependencyModule.kt
+++ b/bugsnag-android-core/src/main/java/com/bugsnag/android/internal/dag/DependencyModule.kt
@@ -1,7 +1,7 @@
 package com.bugsnag.android.internal.dag
 
-import com.bugsnag.android.BackgroundTaskService
-import com.bugsnag.android.TaskType
+import com.bugsnag.android.internal.BackgroundTaskService
+import com.bugsnag.android.internal.TaskType
 
 internal abstract class DependencyModule {
 
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/ConfigChangeReceiverTest.kt b/bugsnag-android-core/src/test/java/com/bugsnag/android/ConfigChangeReceiverTest.kt
index 32c047bddd..160308534d 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/ConfigChangeReceiverTest.kt
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/ConfigChangeReceiverTest.kt
@@ -3,6 +3,7 @@ package com.bugsnag.android
 import android.content.Context
 import android.content.res.Configuration
 import android.content.res.Resources
+import com.bugsnag.android.internal.BackgroundTaskService
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertNull
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/DeliveryDelegateTest.kt b/bugsnag-android-core/src/test/java/com/bugsnag/android/DeliveryDelegateTest.kt
index 09601a756d..9f7291a4d1 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/DeliveryDelegateTest.kt
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/DeliveryDelegateTest.kt
@@ -1,6 +1,7 @@
 package com.bugsnag.android
 
 import com.bugsnag.android.BugsnagTestUtils.generateImmutableConfig
+import com.bugsnag.android.internal.BackgroundTaskService
 import com.bugsnag.android.internal.StateObserver
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertNotNull
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/DeviceDataCollectorSerializationTest.kt b/bugsnag-android-core/src/test/java/com/bugsnag/android/DeviceDataCollectorSerializationTest.kt
index 7fd72996c2..09ca3d3ab3 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/DeviceDataCollectorSerializationTest.kt
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/DeviceDataCollectorSerializationTest.kt
@@ -6,6 +6,7 @@ import android.content.res.Configuration
 import android.content.res.Resources
 import android.util.DisplayMetrics
 import com.bugsnag.android.BugsnagTestUtils.generateDeviceBuildInfo
+import com.bugsnag.android.internal.BackgroundTaskService
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.junit.runners.Parameterized
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/DeviceMetadataSerializationTest.kt b/bugsnag-android-core/src/test/java/com/bugsnag/android/DeviceMetadataSerializationTest.kt
index 06a9e26a3a..c3b8c3d079 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/DeviceMetadataSerializationTest.kt
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/DeviceMetadataSerializationTest.kt
@@ -6,6 +6,7 @@ import android.content.res.Configuration
 import android.content.res.Resources
 import android.util.DisplayMetrics
 import com.bugsnag.android.BugsnagTestUtils.generateDeviceBuildInfo
+import com.bugsnag.android.internal.BackgroundTaskService
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.junit.runners.Parameterized
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/EventFilenameTest.kt b/bugsnag-android-core/src/test/java/com/bugsnag/android/EventFilenameTest.kt
index c533886aeb..75f76b7fb3 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/EventFilenameTest.kt
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/EventFilenameTest.kt
@@ -1,6 +1,7 @@
 package com.bugsnag.android
 
 import com.bugsnag.android.EventStore.EVENT_COMPARATOR
+import com.bugsnag.android.internal.BackgroundTaskService
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertNull
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/EventStoreMaxLimitTest.kt b/bugsnag-android-core/src/test/java/com/bugsnag/android/EventStoreMaxLimitTest.kt
index 864acadb7f..d3432f2289 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/EventStoreMaxLimitTest.kt
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/EventStoreMaxLimitTest.kt
@@ -2,6 +2,7 @@ package com.bugsnag.android
 
 import com.bugsnag.android.BugsnagTestUtils.generateConfiguration
 import com.bugsnag.android.BugsnagTestUtils.generateEvent
+import com.bugsnag.android.internal.BackgroundTaskService
 import com.bugsnag.android.internal.ImmutableConfig
 import com.bugsnag.android.internal.convertToImmutableConfig
 import org.junit.After
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/InternalEventPayloadDelegateTest.kt b/bugsnag-android-core/src/test/java/com/bugsnag/android/InternalEventPayloadDelegateTest.kt
index f5cc73ce74..d7f7724789 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/InternalEventPayloadDelegateTest.kt
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/InternalEventPayloadDelegateTest.kt
@@ -5,6 +5,7 @@ import android.os.storage.StorageManager
 import com.bugsnag.android.BugsnagTestUtils.generateAppWithState
 import com.bugsnag.android.BugsnagTestUtils.generateDeviceWithState
 import com.bugsnag.android.BugsnagTestUtils.generateImmutableConfig
+import com.bugsnag.android.internal.BackgroundTaskService
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertNotNull
 import org.junit.Test
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/LaunchCrashDeliveryTest.kt b/bugsnag-android-core/src/test/java/com/bugsnag/android/LaunchCrashDeliveryTest.kt
index 3978dcb8e6..bd49e955ec 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/LaunchCrashDeliveryTest.kt
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/LaunchCrashDeliveryTest.kt
@@ -2,6 +2,7 @@ package com.bugsnag.android
 
 import com.bugsnag.android.BugsnagTestUtils.generateConfiguration
 import com.bugsnag.android.BugsnagTestUtils.generateEvent
+import com.bugsnag.android.internal.BackgroundTaskService
 import org.junit.After
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertTrue
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/SessionTrackerPauseResumeTest.kt b/bugsnag-android-core/src/test/java/com/bugsnag/android/SessionTrackerPauseResumeTest.kt
index e83491ae65..cb5aab49c8 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/SessionTrackerPauseResumeTest.kt
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/SessionTrackerPauseResumeTest.kt
@@ -4,6 +4,7 @@ import android.app.ActivityManager
 import android.content.Context
 import com.bugsnag.android.BugsnagTestUtils.generateConfiguration
 import com.bugsnag.android.BugsnagTestUtils.generateDevice
+import com.bugsnag.android.internal.BackgroundTaskService
 import com.bugsnag.android.internal.ImmutableConfig
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/SessionTrackerTest.java b/bugsnag-android-core/src/test/java/com/bugsnag/android/SessionTrackerTest.java
index a42bf9f824..de1cd60c5d 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/SessionTrackerTest.java
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/SessionTrackerTest.java
@@ -7,6 +7,7 @@
 import static org.junit.Assert.assertNull;
 import static org.mockito.Mockito.when;
 
+import com.bugsnag.android.internal.BackgroundTaskService;
 import com.bugsnag.android.internal.ImmutableConfig;
 
 import android.app.ActivityManager;
diff --git a/bugsnag-android-core/src/test/java/com/bugsnag/android/BackgroundTaskServiceTest.kt b/bugsnag-android-core/src/test/java/com/bugsnag/android/internal/BackgroundTaskServiceTest.kt
similarity index 99%
rename from bugsnag-android-core/src/test/java/com/bugsnag/android/BackgroundTaskServiceTest.kt
rename to bugsnag-android-core/src/test/java/com/bugsnag/android/internal/BackgroundTaskServiceTest.kt
index 2e071a13fc..b06daee347 100644
--- a/bugsnag-android-core/src/test/java/com/bugsnag/android/BackgroundTaskServiceTest.kt
+++ b/bugsnag-android-core/src/test/java/com/bugsnag/android/internal/BackgroundTaskServiceTest.kt
@@ -1,4 +1,4 @@
-package com.bugsnag.android
+package com.bugsnag.android.internal
 
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertNull
diff --git a/bugsnag-plugin-android-ndk/src/main/java/com/bugsnag/android/NdkPlugin.kt b/bugsnag-plugin-android-ndk/src/main/java/com/bugsnag/android/NdkPlugin.kt
index fab6d402fe..80ff9efad0 100644
--- a/bugsnag-plugin-android-ndk/src/main/java/com/bugsnag/android/NdkPlugin.kt
+++ b/bugsnag-plugin-android-ndk/src/main/java/com/bugsnag/android/NdkPlugin.kt
@@ -25,7 +25,7 @@ internal class NdkPlugin : Plugin {
         private set
 
     private fun initNativeBridge(client: Client): NativeBridge {
-        val nativeBridge = NativeBridge()
+        val nativeBridge = NativeBridge(client.bgTaskService)
         client.addObserver(nativeBridge)
         client.setupNdkPlugin()
         return nativeBridge
diff --git a/bugsnag-plugin-android-ndk/src/main/java/com/bugsnag/android/ndk/NativeBridge.kt b/bugsnag-plugin-android-ndk/src/main/java/com/bugsnag/android/ndk/NativeBridge.kt
index 911af747fb..c3528ab624 100644
--- a/bugsnag-plugin-android-ndk/src/main/java/com/bugsnag/android/ndk/NativeBridge.kt
+++ b/bugsnag-plugin-android-ndk/src/main/java/com/bugsnag/android/ndk/NativeBridge.kt
@@ -17,18 +17,21 @@ import com.bugsnag.android.StateEvent.UpdateContext
 import com.bugsnag.android.StateEvent.UpdateInForeground
 import com.bugsnag.android.StateEvent.UpdateOrientation
 import com.bugsnag.android.StateEvent.UpdateUser
+import com.bugsnag.android.internal.BackgroundTaskService
 import com.bugsnag.android.internal.StateObserver
+import com.bugsnag.android.internal.TaskType
 import java.io.File
 import java.io.FileFilter
 import java.nio.charset.Charset
 import java.util.UUID
 import java.util.concurrent.atomic.AtomicBoolean
 import java.util.concurrent.locks.ReentrantLock
+import kotlin.concurrent.withLock
 
 /**
  * Observes changes in the Bugsnag environment, propagating them to the native layer
  */
-class NativeBridge : StateObserver {
+class NativeBridge(private val bgTaskService: BackgroundTaskService) : StateObserver {
 
     private val lock = ReentrantLock()
     private val installed = AtomicBoolean(false)
@@ -125,7 +128,14 @@ class NativeBridge : StateObserver {
                 makeSafe(event.contextActivity ?: "")
             )
             is StateEvent.UpdateLastRunInfo -> updateLastRunInfo(event.consecutiveLaunchCrashes)
-            is StateEvent.UpdateIsLaunching -> updateIsLaunching(event.isLaunching)
+            is StateEvent.UpdateIsLaunching -> {
+                updateIsLaunching(event.isLaunching)
+
+                if (!event.isLaunching) {
+                    // we refreshSymbolTable on the background to avoid holding up the main thread
+                    bgTaskService.submitTask(TaskType.DEFAULT, this::refreshSymbolTable)
+                }
+            }
             is UpdateOrientation -> updateOrientation(event.orientation ?: "")
             is UpdateUser -> {
                 updateUserId(makeSafe(event.user.id ?: ""))
@@ -164,12 +174,13 @@ class NativeBridge : StateObserver {
     }
 
     private fun deliverPendingReports() {
-        lock.lock()
         val filenameRegex = """.*\.crash$""".toRegex()
+        lock.lock()
         try {
             val outDir = reportDirectory
             if (outDir.exists()) {
-                val fileList = outDir.listFiles(FileFilter { filenameRegex.containsMatchIn(it.name) })
+                val fileList =
+                    outDir.listFiles(FileFilter { filenameRegex.containsMatchIn(it.name) })
                 if (fileList != null) {
                     for (file in fileList) {
                         deliverReportAtPath(file.absolutePath)
@@ -186,8 +197,7 @@ class NativeBridge : StateObserver {
     }
 
     private fun handleInstallMessage(arg: Install) {
-        lock.lock()
-        try {
+        lock.withLock {
             if (installed.get()) {
                 logger.w("Received duplicate setup message with arg: $arg")
             } else {
@@ -204,8 +214,6 @@ class NativeBridge : StateObserver {
                 )
                 installed.set(true)
             }
-        } finally {
-            lock.unlock()
         }
     }
 
diff --git a/bugsnag-plugin-android-ndk/src/main/jni/bugsnag_ndk.c b/bugsnag-plugin-android-ndk/src/main/jni/bugsnag_ndk.c
index 10eada5c2f..c0dce3da34 100644
--- a/bugsnag-plugin-android-ndk/src/main/jni/bugsnag_ndk.c
+++ b/bugsnag-plugin-android-ndk/src/main/jni/bugsnag_ndk.c
@@ -517,10 +517,6 @@ Java_com_bugsnag_android_ndk_NativeBridge_updateIsLaunching(
   bugsnag_app_set_is_launching(&bsg_global_env->next_event, new_value);
   bsg_update_next_run_info(bsg_global_env);
   release_env_write_lock();
-
-  if (!new_value) {
-    bugsnag_refresh_symbol_table();
-  }
 }
 
 JNIEXPORT void JNICALL
diff --git a/bugsnag-plugin-android-ndk/src/main/jni/utils/stack_unwinder.cpp b/bugsnag-plugin-android-ndk/src/main/jni/utils/stack_unwinder.cpp
index 907cb67419..3df2edb00d 100644
--- a/bugsnag-plugin-android-ndk/src/main/jni/utils/stack_unwinder.cpp
+++ b/bugsnag-plugin-android-ndk/src/main/jni/utils/stack_unwinder.cpp
@@ -16,7 +16,7 @@ static unwindstack::Unwinder *crash_time_unwinder;
 // soft lock for using the crash time unwinder - if active, return without
 // attempting to unwind. This isn't a "real" lock to avoid deadlocking in the
 // event of a crash while handling an ANR or the reverse.
-static bool unwinding_crash_stack;
+static std::atomic_bool unwinding_crash_stack = ATOMIC_VAR_INIT(false);
 
 // Thread-safe, reusable unwinder - uses thread-specific memory caches
 static unwindstack::LocalUnwinder *current_time_unwinder;
@@ -114,35 +114,57 @@ static void populate_code_identifier(const unwindstack::FrameData &frame,
 }
 
 void bsg_unwinder_refresh(void) {
-  if (crash_time_unwinder == nullptr) {
-    return;
-  }
+  auto crash_time_maps = new unwindstack::LocalUpdatableMaps();
+  if (crash_time_maps->Parse()) {
+    std::shared_ptr<unwindstack::Memory> crash_time_memory(
+        new unwindstack::MemoryLocal);
+    auto new_uwinder = new unwindstack::Unwinder(
+        BUGSNAG_FRAMES_MAX, crash_time_maps,
+        unwindstack::Regs::CreateFromLocal(), crash_time_memory);
+    auto arch = unwindstack::Regs::CurrentArch();
+    auto dexfiles_ptr = unwindstack::CreateDexFiles(arch, crash_time_memory);
+    new_uwinder->SetDexFiles(dexfiles_ptr.get());
 
-  auto *crash_time_maps = dynamic_cast<unwindstack::LocalUpdatableMaps *>(
-      crash_time_unwinder->GetMaps());
-  if (crash_time_maps != nullptr) {
-    crash_time_maps->Reparse(nullptr);
+    auto old_unwinder = crash_time_unwinder;
+    crash_time_unwinder = new_uwinder;
+
+    // don't destroy an unwinder that is currently in use
+    if (!unwinding_crash_stack.load()) {
+      delete old_unwinder->GetMaps();
+      delete old_unwinder;
+    }
   }
 }
 
 ssize_t bsg_unwind_crash_stack(bugsnag_stackframe stack[BUGSNAG_FRAMES_MAX],
                                siginfo_t *info, void *user_context) {
-  if (crash_time_unwinder == nullptr || unwinding_crash_stack) {
+
+  // we always check unwinding_crash_stack and set *before* attempting to
+  // retrieve the crash unwinder to avoid picking up an unwinder that is about
+  // to be destroyed by bsg_unwinder_refresh
+  static bool expected = false;
+  if (!std::atomic_compare_exchange_strong(&unwinding_crash_stack, &expected,
+                                           true)) {
+    return 0;
+  }
+  auto local_unwinder = crash_time_unwinder;
+  if (local_unwinder == nullptr) {
+    unwinding_crash_stack = false;
     return 0;
   }
-  unwinding_crash_stack = true;
+
   if (user_context) {
-    crash_time_unwinder->SetRegs(unwindstack::Regs::CreateFromUcontext(
+    local_unwinder->SetRegs(unwindstack::Regs::CreateFromUcontext(
         unwindstack::Regs::CurrentArch(), user_context));
   } else {
     auto regs = unwindstack::Regs::CreateFromLocal();
     unwindstack::RegsGetLocal(regs);
-    crash_time_unwinder->SetRegs(regs);
+    local_unwinder->SetRegs(regs);
   }
 
-  crash_time_unwinder->Unwind();
+  local_unwinder->Unwind();
   int frame_count = 0;
-  for (auto &frame : crash_time_unwinder->frames()) {
+  for (auto &frame : local_unwinder->frames()) {
     auto &dst_frame = stack[frame_count];
     dst_frame.frame_address = frame.pc;
     dst_frame.line_number = frame.rel_pc;
diff --git a/examples/sdk-app-example/app/build.gradle b/examples/sdk-app-example/app/build.gradle
index 2039e65123..6391bbd09f 100644
--- a/examples/sdk-app-example/app/build.gradle
+++ b/examples/sdk-app-example/app/build.gradle
@@ -38,7 +38,7 @@ android {
 }
 
 dependencies {
-    implementation "com.bugsnag:bugsnag-android:5.28.2"
+    implementation "com.bugsnag:bugsnag-android:5.28.3"
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
     implementation "androidx.appcompat:appcompat:1.4.0"
     implementation "com.google.android.material:material:1.4.0"
diff --git a/features/fixtures/mazerunner/cxx-scenarios-bugsnag/src/main/cpp/cxx-scenarios-bugsnag.cpp b/features/fixtures/mazerunner/cxx-scenarios-bugsnag/src/main/cpp/cxx-scenarios-bugsnag.cpp
index 7a95d11486..1e42e191a7 100644
--- a/features/fixtures/mazerunner/cxx-scenarios-bugsnag/src/main/cpp/cxx-scenarios-bugsnag.cpp
+++ b/features/fixtures/mazerunner/cxx-scenarios-bugsnag/src/main/cpp/cxx-scenarios-bugsnag.cpp
@@ -404,4 +404,19 @@ Java_com_bugsnag_android_mazerunner_scenarios_MetadataStringsTooLargeScenario_na
     return value / x / 8;
 }
 
+static volatile int *the_value;
+
+int __attribute__((optnone)) get_the_null_value() {
+  // assume this function is very interesting
+  return *the_value;
+}
+
+extern "C"
+JNIEXPORT jint JNICALL
+Java_com_bugsnag_android_mazerunner_scenarios_CXXRefreshSymbolTableDuringCrashScenario_activate(
+    JNIEnv *env, jobject thiz) {
+
+  return get_the_null_value();
+}
+
 }
diff --git a/features/fixtures/mazerunner/cxx-scenarios-bugsnag/src/main/java/com/bugsnag/android/mazerunner/scenarios/CXXRefreshSymbolTableDuringCrashScenario.kt b/features/fixtures/mazerunner/cxx-scenarios-bugsnag/src/main/java/com/bugsnag/android/mazerunner/scenarios/CXXRefreshSymbolTableDuringCrashScenario.kt
new file mode 100644
index 0000000000..5560c0ef99
--- /dev/null
+++ b/features/fixtures/mazerunner/cxx-scenarios-bugsnag/src/main/java/com/bugsnag/android/mazerunner/scenarios/CXXRefreshSymbolTableDuringCrashScenario.kt
@@ -0,0 +1,35 @@
+package com.bugsnag.android.mazerunner.scenarios
+
+import android.content.Context
+import com.bugsnag.android.Configuration
+import com.bugsnag.android.ndk.BugsnagNDK
+import kotlin.concurrent.thread
+
+class CXXRefreshSymbolTableDuringCrashScenario(
+    config: Configuration,
+    context: Context,
+    eventMetadata: String?
+) : Scenario(config, context, eventMetadata) {
+
+    companion object {
+        init {
+            System.loadLibrary("bugsnag-ndk")
+            System.loadLibrary("cxx-scenarios-bugsnag")
+        }
+    }
+
+    external fun activate(): Int
+
+    override fun startScenario() {
+        super.startScenario()
+
+        thread {
+            while (true) {
+                BugsnagNDK.refreshSymbolTable()
+            }
+        }
+
+        Thread.sleep(1L)
+        activate()
+    }
+}
diff --git a/features/fixtures/mazerunner/cxx-scenarios/src/main/cpp/cxx-scenarios.cpp b/features/fixtures/mazerunner/cxx-scenarios/src/main/cpp/cxx-scenarios.cpp
index d71da46bf1..c6fe958d2e 100644
--- a/features/fixtures/mazerunner/cxx-scenarios/src/main/cpp/cxx-scenarios.cpp
+++ b/features/fixtures/mazerunner/cxx-scenarios/src/main/cpp/cxx-scenarios.cpp
@@ -275,3 +275,4 @@ Java_com_bugsnag_android_mazerunner_scenarios_UnhandledNdkAutoNotifyFalseScenari
 }
 
 }
+
diff --git a/features/full_tests/native_crash_handling.feature b/features/full_tests/native_crash_handling.feature
index 21ad8d64d0..69df20ae69 100644
--- a/features/full_tests/native_crash_handling.feature
+++ b/features/full_tests/native_crash_handling.feature
@@ -157,3 +157,18 @@ Feature: Native crash reporting
     And the "lineNumber" of stack frame 0 equals 0
     And the first significant stack frames match:
       | dispatch::Handler::handle(_jobject*) | CXXCallNullFunctionPointerScenario.cpp | 9 |
+
+  Scenario: Refresh symbol table during a crash
+    When I run "CXXRefreshSymbolTableDuringCrashScenario" and relaunch the crashed app
+    And I configure Bugsnag for "CXXRefreshSymbolTableDuringCrashScenario"
+    And I wait to receive an error
+    Then the error payload contains a completed unhandled native report
+    And the exception "errorClass" equals one of:
+      | SIGABRT |
+      | SIGSEGV |
+    And the exception "message" equals one of:
+      | Abort program                                     |
+      | Segmentation violation (invalid memory reference) |
+    And the exception "type" equals "c"
+    And the event "severity" equals "error"
+    And the event "unhandled" is true
diff --git a/gradle.properties b/gradle.properties
index 5101b06fb0..2963133c42 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -11,7 +11,7 @@ org.gradle.jvmargs=-Xmx4096m
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 org.gradle.parallel=true
-VERSION_NAME=5.28.2
+VERSION_NAME=5.28.3
 GROUP=com.bugsnag
 POM_SCM_URL=https://github.com/bugsnag/bugsnag-android
 POM_SCM_CONNECTION=scm:git@github.com:bugsnag/bugsnag-android.git