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

providers/callsigndata/file_download_callsign_data_provider.py

@@ -38,7 +38,7 @@ class FileDownloadCallsignDataProvider(CallsignDataProvider):
     def stop(self):
         self._stop_event.set()
         if self._thread:
-            self._thread.join(timeout=35)
+            self._thread.join(timeout=12)
             if self._thread.is_alive():
                 logger.warning(f"{self.name} callsign data worker thread did not exit on time and will be killed.")