I have a 2014 535d. I live in north Texas so usually doesn't get that cold around here but got below 20 last night and my drivers side door handle would not budge. Didn't want to pull too hard on it, afraid it would break something. All other doors work fine. After the sun came out and it got into the 30's the door works fine now. Same thing happened a couple of weeks ago when the temps got below 20. Anyone have an idea what would be "freezing" up in just that door. No precipitation so it isn't ice.