Sunshade failure. The sunshade runs back and forth on track to close or open cloth cover. While driving with 4 main windows I pushed button to open shade halfway down the line the shade got off track and you could hear plastic cracking noises. I stopped the shade and pushed it closed more cracking noises and the the whole cloth fell and hung blocking all rear view while on freeway at normal speed. I was able to pull over and slowly push and assist cloth back into car frame so it’s not hanging but it no longer works as intended. This is known and per dealership ove 1k for new track and requires moonroof removal to repair. Not covered under warranty