This is one of the problems affecting me too. There is a lot of play on mine so I stopped using it all together.
I bought my VX used, how do I know if it is still under warranty?

If not, how do I remove the door panel? I only see one screw on the entire inside of door. Someone suggested to me that it was the regulator and that it would cost me over $100.

Sorry to rehash this for the people who have already dealt with this problem.