Please direct me elsewhere if this is not the correct place to post this question-

I'm running ZDM7 IR1 on a Netware 6.5 sp6 server.

Everything has been running smoothly until recently.
Now, the server will suddenly stop responding to imaging requests.

On investigation, the console shows no errors or abends, all zenworks modules are running fine.
The volumes on this server are also not viewable in ConsoleOne and on Windows workstations when this happens.
The volumes are mounted and active.
Login scripts that call applications from these volumes DO work.
If the server sits for a long period of time in this state, it will freeze up.
A reboot of the server fixes the problem.
I've looked through the logs and tried reloading zenworks services, cifs, etc. but nothing I do will correct the situation except a reboot.

Anyone have any idea what might be causing this, or where to look for the cause?