Loose rear view mirror (due to extreme heat)...?

So, a couple days ago I was driving around and noticed that my rear view mirror was bouncier than normal. Upon messing with it, I thought it came loose at the ball and socket joint. But upon further jiggling, I noticed that the whole assembly was loosened. After grabbing the correct sized torx driver, I tightened up the screw that holds it to the windshield. No problems after that. I usually park in shaded areas except when I visit my grandmother on the weekends. At those times, I park on the street, in direct sunlight. These past few days, when the mirror came loose, we had a big and sudden heat wave. Could that sudden extreme raise in temps cause that main mirror screw to loosen? Has anyone else experienced this?

 

Blue lock-tite.

 

Yeah, I'm gonna do that in the next week or two. Just wondering if this was a common issue in sudden heat surges.

 

I live in AZ. It's been 110 average. No problems like that.

 

I dunno, I feel like the loose/rattley mirror thing is pretty well established and kinda pops up outta nowhere.