Haven't had that problem, but I did notice that it won't go up while it is in gear. I always have to shift if into neutral (6spd). I also had a problem one time when the divider in the trunk fell down and it wouldn't go back up until I fixed that.

If yours is rattling, I wouldn't be surprised to hear that they were physically pulling on something at the dealership to try to get it to release and they damaged it.

The problem I have been having is that the glass won't latch into the trunk door when I put it back up. I have to physically give it a little push then hold the button back down so the motor draws it in the rest of the way.