System dies in ISC 2.2

[Metallica Rules]

I have ISC 2.2 that was upgraded from 2.0.2, and when I am in vpix.  For
some reason my computer just dies, and goes into the reboot phase.
I get no message.  The screen goes blank for an instant, as if I had hit
reset on my computer, and then starts checking ram on startup and reboots.

Anybody seen this before.  This has happend to me about three times now.

Chuck
savage%tigger at boulder.colorado.edu