I happened to open the cover for the driver's side vanity mirror the other day and discovered it was cracked. We never use it so I have no idea how long it was that was that way... It appears to be a stress or manufacturing defect. I contacted Tesla and they first said that I had probably hit it with something... I told them no and it would be hard to hit it in that location regardless. I also pointed out that there were no impact signs on the cover and that the stress cracks were on the inside of the glass (you could tell by running a nail over it). Then they changed their story to "well, you may be right but since we have no way to verify how or why it cracked, we can't warranty it." I expressed my disappointment and dismay and was meet with the verbal equivalent of a shrug... So, it is going to cost me $135 for a new one... Tesla customer service IS an oxymoron.