Troubleshooting server unresponsiveness

[Marty Jack]

Recently on Server 9 and Server 10, I am finding that once in a while when I come back to the computer, either the keyboard still works and the mouse is unresponsive, or the mouse still works and the keyboard is unresponsive.  If I ssh in and gdb, I find the server in the poll in WaitForSomething.  Restarting the server fixes it until the next time it happens.

If someone who has done this before has a suggestion on a line of attack to troubleshoot, it would be helpful.