When I did residential wiring we had a rash of cabinet guys who liked to use 3" screws , they would run them in at an angle and hit wires on the side of the stud or slide past the nail plate and stab the wire. We were wiring 60 houses a month , so by the time we figured out what was going on we had 15 houses with ruined gfci circuits in the kitchens and baths.....