Maybe you have temporary network issues and you are missing pings/pongs? look at confirmationwindowSize to play with reconnections.
Also, configure retries
Sorry, the version is 2.2.5 final.
Thank you for you hints. I will add tomorrow these lines in each of the four existing connection-factories:
The code is taken from this thread: http://community.jboss.org/thread/148405
After testing the new jms configuration, I will report the results.
Actually the system is running over one hour without any crashes. It seems that the new jms config solved the problems. Thank you very much!