diff --git a/package-lock.json b/package-lock.json
index 0e08bc5..ac2c33b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@ulms/api-clients",
-  "version": "7.4.1",
+  "version": "7.4.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@ulms/api-clients",
-      "version": "7.4.1",
+      "version": "7.4.2",
       "license": "MIT",
       "dependencies": {
         "axios": "1.6.2",
diff --git a/package.json b/package.json
index 78e743a..474c222 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@ulms/api-clients",
-  "version": "7.4.1",
+  "version": "7.4.2",
   "description": "JavaScript API clients for ULMS platform",
   "keywords": [],
   "homepage": "https://github.com/foxford/ulms-api-clients-js#readme",
diff --git a/src/error.js b/src/error.js
index 7b83aea..6b35956 100644
--- a/src/error.js
+++ b/src/error.js
@@ -34,25 +34,12 @@ export class PresenceError extends Error {
     this.name = 'PresenceError'
   }
 
-  static get kinds() {
-    return {
-      RECOVERABLE_SESSION_ERROR: 'recoverable_session_error',
-      UNRECOVERABLE_SESSION_ERROR: 'unrecoverable_session_error',
-    }
-  }
-
   static get recoverableTypes() {
     return {
       KEEP_ALIVE_TIMED_OUT: 'KEEP_ALIVE_TIMED_OUT', // client-side error
-      PING_TIMED_OUT: 'PING_TIMED_OUT', // client-side error // todo: remove it
-
-      // slow_subscriber -> slow_consumer
-      SLOW_SUBSCRIBER: 'SLOW_SUBSCRIBER', // todo: remove it
-      SLOW_CONSUMER: 'SLOW_CONSUMER',
-
-      // terminated -> server_shutdown
-      TERMINATED: 'TERMINATED', // todo: remove it
       SERVER_SHUTDOWN: 'SERVER_SHUTDOWN',
+      SLOW_CONSUMER: 'SLOW_CONSUMER',
+      WS_ERROR: 'WS_ERROR', // client-side error
     }
   }
 
@@ -62,13 +49,10 @@ export class PresenceError extends Error {
       INTERNAL_SERVER_ERROR: 'INTERNAL_SERVER_ERROR',
       NOT_CONNECTED: 'NOT_CONNECTED', // client-side error
 
-      // replaced -> session_replaced
-      REPLACED: 'REPLACED', // todo: remove it
       SESSION_REPLACED: 'SESSION_REPLACED',
 
       SERIALIZATION_FAILED: 'SERIALIZATION_FAILED',
       UNKNOWN_ERROR: 'UNKNOWN_ERROR', // client-side error
-      WS_ERROR: 'WS_ERROR', // client-side error
 
       // currently unused and commented (todo: comment or remove)
       CONNECT_TIMEOUT: 'CONNECT_TIMEOUT', // ✅
@@ -87,12 +71,6 @@ export class PresenceError extends Error {
     return new PresenceError(errorType)
   }
 
-  static isRecoverableSessionError(error) {
-    const { type } = error
-
-    return type === PresenceError.kinds.RECOVERABLE_SESSION_ERROR
-  }
-
   static isReplacedError(error) {
     if (!(error instanceof PresenceError)) return false
 
diff --git a/src/ws-transport.js b/src/ws-transport.js
index 88d33ad..7b214c4 100644
--- a/src/ws-transport.js
+++ b/src/ws-transport.js
@@ -17,6 +17,7 @@ const KEEP_ALIVE_TIMED_OUT_ERROR_PAYLOAD = {
 }
 const WS_CLOSED_ERROR_PAYLOAD = {
   payload: {
+    is_transient: true,
     title: 'Connection closed',
     type: 'ws_error',
   },