Came here searching for this issue with my X Plaid. I have appointment scheduled with Tesla and they put "check tire pressure" as far as vibration goes. Vibration is pronounced around 35mph speed and it goes away within a minute or two. Happens every morning or if car not driven for a while. Tire pressure is set at 42 (picked up with random pressure in all tires ranging from 41 to 48) - I doubt it is tires or their pressure. It feels like driving on rough road and my street is anything but rough...