As alex has said, I've had two locks play up. The second one was easy, was still in the intermittent phase and I was on the phone to alex less than 24 hours after it started playing up. The first one was a PITA, affected the rear driver's side door. It hacked me off to the point where I told Alex I was ready for him to cut through the door skin. By a miraculous fate, it sorted itself out (maybe the car heard me?).