Rear view mirror doesn't hold tight

[CSK1]

Took the car to my detailer this morning, he's going to give her a Gyeon ceramic coating. When I took the cover off my rear view wing mirror on the driver's side was slightly in and when I tried to push it back in place it seemed very loose. Tried to put the mirrors back in and out again electrically but on the driver's side it stays very loose. Anyone know how I can solve this without a visit to the dealer? Thanks.