My M has had some issues, some of which the members of this forum shared, but most seemed to be able to get fixed / handled by myself or the dealer (still wish we had a better fix for the steering wheel)...but regardless, there was one issue that I seemed to be in the minority of:
A loud popping / cracking noise coming from the sunroof shade.
It started happening out of nowhere and could easily be recreated by just pushing slightly on the shade. I tried to diagnose the issue myself, brought it up in multiple forums, and brought the car into the dealer 3 seperate ocassions...but was met with either
"We can't find the issue" or
"There isn't an issue."
Finally, I had enough, I knew I wasn't crazy, so I told my local dealer that I don't care if it's covered or not, please just replace the shade and I will pay out of pocket.
Well, when they took off the headliner to reach the shade, they noticed the sunroof cassette / rack had a huge crack in it. We were all pretty stumped as to what could cause this. Unfortunately it's not covered under warranty
however since I continued to bring the car in for the same issue, they were nice enough to replace the entire cassette and shade for me free of charge (apparently a $2k part).
No idea what could've caused this, but glad it's finally taken care of. Sorry if I blew up on anyone
Edit: Video won't upload / will try again tomorrow