Remote-to-Local Hangs without Error (Deadlock)

We are experiencing an issue in which the bridge randomly stops polling messages on a remote_to_local queue. There are no errors in the error log and nothing to indicate there is any issue what so ever. We restart the JMS bridge and the remote messages are retrieved successfully. Is there something that anyone can think of that might be causing the issue? Here is some additional information regarding the environment.
 
-          The router is running as a windows service
-          We are connecting to WebSphere MQ version 6 running on a mainframe
-          We restart the service every morning
-          The issue is sporadic and non-repetitive


Regards,
T