Yesterday, I pulled up to my parents' house and the kids all got out. As I was showing Model X to them, the passenger FWD started to act strange, as if something were 12" from the door. It would set out only 8" from the body, then try to move up and stop. The touchscreen noted that an obstacle was present (clearly there was none). We moved the car into another location on the opposite side of the street, just to see if it was sensing something odd, but that didn't work. I knew it was a long shot, but I reset the MCU to no avail. Resigned to a future service center visit, we continued on our way toward the Blues game in St. Louis. When we stopped for dinner, though, the car showed the obstruction was gone. Apparently, driving it a bit longer seemed to clear up the sensed obstruction (probably while needing the sensors for autopilot). Since then we've been using the doors a few times, and haven't had the issue come back. So if your car seems to be reporting something blocking the FWD's, driving may clear it up.