Is it when you go up about half way of the rep when your wrists pop down and your hands are like almost disconnected from the wrist? On upright rows I just pull up, displace wrists at halfway, and continue on up to continue the rep. Never gives me any pain during or problems afterwards, I think it's pretty harmless.
I did fracture both epiphyseal plates on my right wrist, but surprisingly its my left wrist that dislocates easiest. I guess I just rely on my connective tissue to keep my hands attached to the bar, lol.