condensation forming inside window
 

I think this might be a design problem, but only during the winter months and infrequently (I think when it rains, don't know, car is parked for a week outside) the inside of the window has so much condensation that it takes a towel to wipe off. Happened once so far this winter and 2-3 times last winter. Live in Charlotte, NC.

From what I have read on other car forums, it probably isn't a leak but a design flaw. Any ideas? 2006 Pontiac G6 2 door coupe. If you notice, the windows automatically go up and down when you open/close the car door.

Of course, car just came out of warranty. Dealer is no help.