Rear view mirror: anyone else experiences this?

I am not sure if it's a common problem but I've noticed that the rear view mirror tends to slip a little every time it gets hot. The connection becomes soft and gravity pulls it down a little each time. I've noticed that very often, after a warm day, when I drive the car the position of the mirror would change. I use the same key and same seat position so it can't be that.

I will have the dealer look at it when I bring it in for service but was curious if anyone else has experienced this. When it's cold the mirror's joint is stiff and takes more effort to move. I've experience this for some time now but wanted to drive it for a while before I'm certain it wasn't me.