I had this issue pre-Christmas when temperatures were down to -9. Initially was the drivers door. Had this issue again yesterday and today at -5 when it was all doors. Yesterday was bad as I could not even get the fuel filler flap open. Very frustrating. Booked into the the dealer on Thursday for them to look at. I wont be accepting pour warm water on it or wrap something warm around it. Should not be happening. Fingers crossed for an easy fix.