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We had this problem for some time using GF v2ur2. We improved the overal stability with the following actions.
1) apply latest patch of OS
2) use -server mode for the JVM
3) check "Allow non component caller" in the datasource
4) tune the ORB. We are now using -Dcom.sun.corba.ee.transport.ORBTCPTimeouts=500:30000:30:999999
Also, we sometimes injected EJBs using @Resource. It works but I suspect some issue with it. Make sure you use @EJB to inject beans.
Hope it helps...
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