Meh. I've had the exact same issue with a VW Passat. It was also a known issue in car circles. There was a bit in the door mechanism that collected condensed w

Meh. I've had the exact same issue with a VW Passat. It was also a known issue in car circles. There was a bit in the door mechanism that collected condensed water and it either froze the door shut or it wouldn't close. I had to drive a good 50km with the driver's door belted to my thigh so it wouldn't flap open in corners... Finally the interior temp got high enough so the tiny bit of ice melted and the door stayed shut. The only sorta-solution to this would've been to completely dismantle the door and heavily lubricate the mechanism with a petroleum-based substance that kept the water out.