Driving down the highway when I heard a muted thump and the wind noise changed pitch. Upon arriving at my destination, I noticed the roof cover panel between the falcon wing doors was long gone. Anyone else have this problem? Could this be related to the rubber degeneration around the roof panels previously reported by a significant number of 2016 and newer model X owners. Tesla contends that it is only a cosmetic problem. I'm inclined to doubt that contention at this juncture.