Mine rattles and is visibly drooping. My dealer ripped out the headliner once to fix a kink in the washer fluid hose and they didn't put it up very well. The headliners are pretty poorly designed for models with a moonroof. I don't know how they managed to do that but as you've seen it is not an uncommon problem. However, I hear that it is very possible to fix the rattles and what not once the dealer actually puts the darn thing up correctly. Annoying but fixable.