Hi !
We upgraded to 1.2.2 (794) three days ago.
After the upgrade, the engine began to shuts down every hour. Exactly quarter to , the Bus shuts down. Doesn't matter if all mobile devices is disconnected or not (so it can't be an evil device).

I cant see any traces in post office log but this is the traces in default.pipeline1.groupwise-AppInterface.log:

Code:
2012-03-07 18:42:39.144 DEBUG [ATT_POOL_Thread-9] [gwconnectorlogic:1206] [userID:inbr] [eventID:] [objectID:] [AttachmentsDownload] Attachment TEXT.htm sent to engine successfully
2012-03-07 18:45:04.774 DEBUG [MainThread] [GenericApplicationInterface:312] [userID:] [eventID:] [objectID:] [] Got TERM signal
2012-03-07 18:45:04.775 INFO [MainThread] [AppInterface:326] [userID:] [eventID:] [objectID:] [] shutdown: Shutting down connector...
[07/Mar/2012:18:45:04] ENGINE Bus STOPPING
[07/Mar/2012:18:45:04] ENGINE HTTP Server cherrypy._cpwsgi_server.CPWSGIServer(('192.168.5.5', 4500)) shut down
[07/Mar/2012:18:45:04] ENGINE Stopped thread '_TimeoutMonitor'.
[07/Mar/2012:18:45:04] ENGINE Bus STOPPED
2012-03-07 18:45:04.823 INFO [MainThread] [AppInterface:333] [userID:] [eventID:] [objectID:] [] KeepAlive state: False
2012-03-07 18:45:04.823 INFO [MainThread] [AppInterface:342] [userID:] [eventID:] [objectID:] [] queueEventThread state: False
2012-03-07 18:45:04.823 INFO [MainThread] [AppInterface:364] [userID:] [eventID:] [objectID:] [] Exiting Attachment Worker threads.
2012-03-07 18:45:04.827 INFO [MainThread] [AppInterface:373] [userID:] [eventID:] [objectID:] [] Exiting Worker threads.
2012-03-07 18:45:04.830 INFO [MainThread] [AppInterface:380] [userID:] [eventID:] [objectID:] [] GroupWise connector stopped
2012-03-07 18:45:04.831 INFO [MainThread] [GenericApplicationInterface:371] [userID:] [eventID:] [objectID:] [] Telling Sync Engine that we are shutting down...
2012-03-07 18:45:04.832 DEBUG [MainThread] [GenericApplicationInterface:920] [userID:] [eventID:] [objectID:] [] Attempting to acquire lock for engineConnections
2012-03-07 18:45:04.832 DEBUG [MainThread] [GenericApplicationInterface:922] [userID:] [eventID:] [objectID:] [] Acquired lock for engineConnections
2012-03-07 18:45:04.832 DEBUG [MainThread] [GenericApplicationInterface:940] [userID:] [eventID:] [objectID:] [] Releasing lock for engineConnections
2012-03-07 18:45:04.833 DEBUG [MainThread] [GenericApplicationInterface:942] [userID:] [eventID:] [objectID:] [] Released lock for engineConnections
2012-03-07 18:45:04.833 DEBUG [MainThread] [GenericApplicationInterface:943] [userID:] [eventID:] [objectID:] [] Using engine connection 184252032
2012-03-07 18:45:04.851 DEBUG [MainThread] [GenericApplicationInterface:965] [userID:] [eventID:] [objectID:] [] Releasing engine connection 184252032
2012-03-07 18:45:04.851 INFO [MainThread] [GenericApplicationInterface:332] [userID:] [eventID:] [objectID:] [] Shutting down...
What can it be ?