Give threads less time to shut down gracefully. Attempt shutdown() rather than stop() on the telnet connections to see if that improves things

core/cleanup.py

@@ -35,7 +35,7 @@ class CleanupTimer:
 
         self._stop_event.set()
         if self._thread:
-            self._thread.join(timeout=15)
+            self._thread.join(timeout=5)
             if self._thread.is_alive():
                 logger.warning("Cleanup worker thread did not exit on time and will be killed.")
 

core/data_providers.py

@@ -91,7 +91,7 @@ class DataProviders:
         for t in threads:
             t.start()
 
-        deadline = time.monotonic() + 40
+        deadline = time.monotonic() + 15
         for t in threads:
             t.join(timeout=max(0.0, deadline - time.monotonic()))
         still_running = [t for t in threads if t.is_alive()]