Critical server error!!!!

i really need help to solve this problem the abend message is: “Server-4.11a: Garbage Collection detected a corrupt memory node at 0x0F1F1E90″… after the message the server restarts…. it happen any time of the day (do not have a pattern)…

Additional Information:
The NetWare OS detected a problem with the system while executing a process owned by SERVER.NLM. It may be the source of the problem or there may have been a memory corruption.