I'm not sure of the cause myself, which is why I suggested EMI/RFI as a possibility in my previous post (fits well with "crackles").
From the 3rd pic in the OP, there's a very large hit on USB logged, that would certainly get me digging deep and the H100i is probably the rarest item on USB on that system.
Also noted there was the fact that similar had occurred before and it had been fixed by a driver (change/update).