I am facing the exact same problem.
After spending so much time to get my pc stable, I got advice from a support ticket that maybe the CPU is problematic.
I asked for RMA, and they don't like the photos I have provided when building the pc. Ok, the serial needs a bit of effort to read a specific number, but it is visible that the number is this one (its a 4).
However, the RMA asked for a new photo, with the serial being more "visible" and include the ticket id in a paper.
What they are actually asking is to spend 5-6 hours, in the hope that the new photo will be "more visible". Which is a hope, as the cpu is shiny, and the serial is very faint.
But what really bother me, is that I have to physically move where the pc is, shutdown the pc (and loose for ever the stuff that the pc needs to collect from the internet), and a) remove the cooler; b) clear the thermal paste from the cpu; c) try to take a photo in the hope that my phone will take a better picture (how?); d) remove the thermal paste from the cooler; e) reinstall the cooler.
And of course, all this fuss for is for approving the RMA. I have to redo all this, when I should send the cpu for a replacement, shouldn't I?
What is AMD trying to achieve by requesting this photo?