My first problem in 12 months ownership from new, my wife complained about a rattle that has started from her door, on checking it appears that the rear window channel has come loose from the inside door panel and when the door is opened the glass can be lifted up about two inches.
I think its just a matter of removing the door panel and replacing the securing bolt that holds the window channel at least I hope thats all it takes, I have it booked in next week for repair at my local VW dealer and will keep you posted.
I think what has caused the problem is when you pull the door handle from the outside the window does not come down quick enough when the door opens and the glass catches on the roof rubber, and over time this has shaken the glass and the channel retaining bolt has come loose.
Bill T