However starting this weekend, and with somewhat increasing frequency, the game is resetting during play

Twice in a row just now:
- Powered Game on (so, not overheating or anything)
- Starts game
- After about 5 shots, flippers die, music dies; LEDs still working
- ~10 seconds later get Ubuntu desktop / black
- ~10 seconds later get "P-ROC not found"
I haven't had a 3rd time; need to go back to work now .. double
