I just realized I never replied to this thread. Yes, by "cold boot" I mean the PC is completely shut down and power discharged. This issue still occurs but it sounds like I'm out of warranty now :).
I have a hunch this may be the CPU not seating 100% correctly but I didn't want to pull all that apart if it was still under warranty. I'll keep trying a few things and if I can't fix it I may schedule a repair visit.
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