This is the first I've heard of this happening. Does anyone else run the clock display 100 percent of the time?

Maybe. Just the other day I remarked to myself "Hey, the Empeg hasn't been spontaneously rebooting lately. What changed?" Well, aside from some Hijack updates, the main change is that I haven't been running clock visuals (I did for a while). I'll switch back to see if it starts rebooting. It also froze several times -- I'd leave it running overnight and find clock showing frozen time display from middle of the night.