I’ve had this issue intermitently on my batch 1 FW13 7840U. p/0 are the two most affected. Re-seating/klapton tape tac’ing has been my fix in the past, but it’s been getting progressively worse over time - and does seem related to heat (I notice it appear when doing compiles/video work especially). Heat is probably making whatever grounding/insulation issue more noticeable is my guess.