diff --git a/common/src/generic_connection.rs b/common/src/generic_connection.rs
index 908f3ebc..722fa7c6 100644
--- a/common/src/generic_connection.rs
+++ b/common/src/generic_connection.rs
@@ -376,11 +376,18 @@ where
                     return Err(ConnectionError::FatalError(error));
                 }
                 ReceiverMsg::Finished { frame_stack } => {
+                    // Finished here means we have seen all frame stacks of the acquisition,
+                    // it does _not_ mean that the data consumer has processed them all.
+
+                    // do stats update here to make sure we count the last frame stack!
+                    self.stats.count_stats_item(&frame_stack);
                     self.stats.log_stats();
                     self.stats.reset();
+
                     return Ok(Some(frame_stack));
                 }
                 ReceiverMsg::FrameStack { frame_stack } => {
+                    self.stats.count_stats_item(&frame_stack);
                     return Ok(Some(frame_stack));
                 }
             }
@@ -408,7 +415,6 @@ where
                     return Ok(Some(left));
                 }
                 assert!(frame_stack.len() <= max_size);
-                self.stats.count_stats_item(&frame_stack);
                 Ok(Some(frame_stack))
             }
             Ok(None) => Ok(None),
@@ -441,6 +447,7 @@ where
     }
 
     pub fn close(mut self) {
+        debug!("GenericConnection::close");
         if self
             .bg_thread
             .channel_to_thread()
diff --git a/common/src/lib.rs b/common/src/lib.rs
index 8e029341..2f2ef0ef 100644
--- a/common/src/lib.rs
+++ b/common/src/lib.rs
@@ -4,7 +4,6 @@ pub mod decoder;
 pub mod frame_stack;
 pub mod generic_connection;
 pub mod generic_receiver;
-pub mod py_buffer_for_slot;
 pub mod py_cam_client;
 pub mod py_connection;
 pub mod stats;
diff --git a/common/src/py_buffer_for_slot.rs b/common/src/py_buffer_for_slot.rs
deleted file mode 100644
index 4d839246..00000000
--- a/common/src/py_buffer_for_slot.rs
+++ /dev/null
@@ -1,19 +0,0 @@
-use std::ffi::c_int;
-
-use ipc_test::Slot;
-use pyo3::{ffi, pyclass, pymethods};
-
-// FIXME: can/should we make this Send'able?
-#[pyclass(unsendable)]
-struct SlotBuffer {
-    slot: Slot,
-}
-
-impl SlotBuffer {}
-
-#[pymethods]
-impl SlotBuffer {
-    unsafe fn __getbuffer__(&self, view: *mut ffi::Py_buffer, flags: c_int) {
-        todo!()
-    }
-}
diff --git a/common/src/py_connection.rs b/common/src/py_connection.rs
index 65cff3cb..3cf3e06a 100644
--- a/common/src/py_connection.rs
+++ b/common/src/py_connection.rs
@@ -177,10 +177,14 @@ macro_rules! impl_py_connection {
                 }
 
                 pub fn close(&mut self) -> PyResult<()> {
-                    let conn_impl = self.get_conn_mut()?;
-                    conn_impl.log_shm_stats();
-                    conn_impl.reset_stats();
-                    Ok(())
+                    if let Some(mut conn_impl) = self.conn_impl.take() {
+                        conn_impl.log_shm_stats();
+                        conn_impl.reset_stats();
+                        conn_impl.close();
+                        Ok(())
+                    } else {
+                        Err(PyConnectionError::new_err("already closed".to_owned()))
+                    }
                 }
 
                 pub fn is_running(&self) -> PyResult<bool> {
diff --git a/libertem_dectris/src/background_thread.rs b/libertem_dectris/src/background_thread.rs
index e28968ae..93f2a4bb 100644
--- a/libertem_dectris/src/background_thread.rs
+++ b/libertem_dectris/src/background_thread.rs
@@ -154,8 +154,16 @@ fn check_for_control(
             msg: "received StartAcquisitionPassive while an acquisition was already running"
                 .to_string(),
         }),
-        Ok(ControlMsg::StopThread) => Err(AcquisitionError::Cancelled),
-        Err(TryRecvError::Disconnected) => Err(AcquisitionError::Cancelled),
+        Ok(ControlMsg::StopThread) => {
+            debug!("check_for_control: StopThread received");
+
+            Err(AcquisitionError::Cancelled)
+        }
+        Err(TryRecvError::Disconnected) => {
+            debug!("check_for_control: Disconnected");
+
+            Err(AcquisitionError::Cancelled)
+        }
         Err(TryRecvError::Empty) => Ok(()),
     }
 }
@@ -165,6 +173,10 @@ fn serialization_error(
     msg: &Message,
     err: &serde_json::Error,
 ) {
+    log::error!(
+        "background_thread: serialization error: {}",
+        err.to_string()
+    );
     from_thread_s
         .send(ReceiverMsg::FatalError {
             error: Box::new(AcquisitionError::SerdeError {
@@ -175,10 +187,6 @@ fn serialization_error(
             }),
         })
         .unwrap();
-    log::error!(
-        "background_thread: serialization error: {}",
-        err.to_string()
-    );
 }
 
 /// Passively listen for global acquisition headers
@@ -396,6 +404,7 @@ fn background_thread_wrap(
             })
             .unwrap();
     }
+    info!("background_thread_wrap: done");
 }
 
 fn drain_if_mismatch(
@@ -444,6 +453,8 @@ fn background_thread(
     mut shm: SharedSlabAllocator,
 ) -> Result<(), AcquisitionError> {
     'outer: loop {
+        let thread_id = std::thread::current().id();
+        info!("background_thread: connecting to {uri} ({thread_id:?})");
         let ctx = zmq::Context::new();
         let socket = ctx.socket(zmq::PULL).unwrap();
         socket.set_rcvtimeo(1000).unwrap();
@@ -466,8 +477,11 @@ fn background_thread(
                         &mut shm,
                     ) {
                         Ok(_) => {}
-                        Err(AcquisitionError::Disconnected | AcquisitionError::Cancelled) => {
-                            return Ok(());
+                        Err(
+                            msg @ (AcquisitionError::Disconnected | AcquisitionError::Cancelled),
+                        ) => {
+                            debug!("background_thread: passive_acquisition returned {msg:?}");
+                            break 'outer;
                         }
                         Err(e) => {
                             from_thread_s
@@ -496,7 +510,7 @@ fn background_thread(
                         Ok(header) => header,
                         Err(err) => {
                             serialization_error(from_thread_s, &msg, &err);
-                            break;
+                            continue 'outer;
                         }
                     };
                     debug!("dheader: {dheader:?}");
@@ -510,7 +524,7 @@ fn background_thread(
                             Ok(header) => header,
                             Err(err) => {
                                 serialization_error(from_thread_s, &msg, &err);
-                                break;
+                                continue 'outer;
                             }
                         }
                     } else {
@@ -529,7 +543,7 @@ fn background_thread(
                     ) {
                         Ok(_) => {}
                         Err(AcquisitionError::Disconnected | AcquisitionError::Cancelled) => {
-                            return Ok(());
+                            break 'outer;
                         }
                         Err(e) => {
                             from_thread_s