Obsession II locking up

Last week my Obsession II locked up twice, both times I was out of the room when it happened, but when I returned to the console none of the buttons would work, and the time had stopped running on the monitor.  This is the first time months that I have used this console, most of the times it's students running it, so I don't know if it's been happening other times.

With both lockups I had to kill power to the RPU and reboot to regain control of the system.

Attached is the diagnostics screen from the second time the console locked up.

Anyone have this happen to them and have a possible solution?

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