Yep. This. It's an on/off switch for when it turns off. Drives me a bit crazy that nobody knows what causes it, and I refuse to hazard a guess, as it'll be nonsense until we know for sure. The actual vibration doesn't bother me as it goes away quickly, but I would love to know why. The 35-50mph vibration is much more of a nuisance, though it has been minimized to some degree with the 2023.44 update, but I doubt Tesla can eliminate it entirely since they can't afford to make this car RWD fully (which is when it's completely gone).