I'm having a spurious bug where the touchscreen will get phantom presses on the volume down (bottom right). When I happens I can see the volume popup on the the 17" screen and see it go down to mute. It started happening the 2nd week in October, shortly after I upgraded to LTE (This is a March 2015 P85D). It's probably connected with the upgrade (they have to take the display apart) but I'd like to have a reproducible case before brining it in for service. It seems to be related to having the sunroof open and the angle of the sun inside the car but it's been very difficult to reproduce. When it first started happing, I noticed a thin brush like hair sticking up in the spot were the volume down is on the screen. I thought that this plus heat was causing the screen to think there was a touch there. I used some tweezers and pulled out the hair. About a week later it happened again. It continues to happen with the sunroof open but I can't find the pattern. For example. This weekend with 4+ hours of driving with the sunroof open, it happened twice. Neither my wife or I could figure our why. It doesn't seem to be direct sunlight hitting the screen. This morning for the first time it happened with the sunroof closed (although from 6 to 5 volume then it stopped). Has anyone have this bug before?