It's the ice not the cold. The sticky window issue only arises when ice partially melts and then freezes in around the frameless windows. I have only had this happen once in our climate ( including 5 years with the same window system on an 02 TT )as extreme cold usually means extreme dry. My A5 has performed flawlessly in the extreme cold.I have been in -7C this week and couldnt get the door open (or closed when it finally opened) due to frameless window. audiballin - how did the windows cope with -45??