yep. same here again. frozen this morning. couldn't drive off as the door wouldn't lock. it finally unfroze enough to lock. drove to work and it wouldn't let me out. 10 minutes of gentle persuasion and i escaped. same tonight on the way home. right now it is sat on my drive with the engine running trying to thaw it out.
It's only -6C but with the moisture yesterday the age old design problem rears its head.
I'm buying a new car this year.
It wont be a BMW.