CrossRoads:
I've run traces under the crystal, but only lines that don't change much, like Reset, or some signal that I have a plan for.Try high speed serial transfers, like 115200, 230400, see if anything pops up.
I was using 115200, that seemed good. I'll have to try 230400.
Do you see the frequency change if let the board stabilize temperature wise?
I'd have to check. It can't be heating up much, but I'll leave it off for a while then see what things look like.