Look in the console logs and see if there were a lot of long held locks prior to the crash occurring.
If debug_capture_timeout=10 setting is in the notes.ini file there is a possibility that this can cause long held locks and eventually a crash.
If the setting debug_capture_timeout=10 setting is required and long held locks occur which lead to a crash then we recommend reducing this setting to 1. If problem goes away then you may want to notify IBM with a PMR to let them know what you experienced and the change to resolve the issue because this issue should be fixed. If this change does not resolve your issue then we may need to further look into the long held locks to see if a newer issue is now occurring.