Those aren't macro photos. There was a reason I asked for macro photos. The pins need to be scrutinized. I can't scrutinize the pins in those photos. This is a macro photo:
View attachment 25921
View attachment 25922
The only way to see pin damage is via macro photography.
That means the camera has suffered impact damage. NEVER let "the kids" play with expensive camera equipment....just sayin'....
You have all the latest/greatest firmware, which I always recommend against. But in this case that is probably not your problem. The "rubbing" raises a HUGE flag, though. Either somebody dropped it or it took a hard landing or something. You would know better than any of us.
D