Well, I guess it isn't random...it's while it's been CPU intensive for a period.
Anyway, I'm using a crappy 300+ watt ATX PSU to supply my OPUS 320 + the water pump and HDRadio (since unplugged) while I bench test...

I'm hoping it's the AC PSU *****ing, and not the OPUS...don't want to ruin my precious OPUS!!

I have the load spread out over a couple on the 12V rails...
2 rails feeding the OPUS, 1 for the pump/HDRadio.

I guess I have to limit myself to 15 minutes sessions at a time!?