Started experiencing a new problem on our less than month old Model S - after exiting the car, it will not shut off. I can lock it, I can get in and out of the car, open close doors, nothing changes - the car will not turn off until it's rebooted with the double thumb salute. Nothing is on the seats at all, so it's not the seat senor being triggered (unless of course it's broken). Trying to figure out whether this is a software issue or a sensor problem, hence my question to see if others are seeing it? Firmware version 17.3.2 here.