dell pe2650, nw65sp5 and client 4.91sp2

randomly the server just hangs and stops responding. When I try to browse
the server volumes, the windows hangs and get a "volume not accessible
message" in windows. On the server console, if I issue a command, it does
not response. There is no abend report and nothing writting to the abend
log. Is there a way to do a dump to see what is causing the

I will look into upgrading a hardware firmware and drivers.

Thanks in advance.