That happened to me (for the first time) this morning. (My car has only 1,500 miles on it.) When I used the car again, everything was working again.
I have occasionally been losing park assist, blindspot, lane-keeping, regen braking, etc. Reboot doesn't help, but the car resets itself after not driving for a while. Telsa technician thinks I may have an intermittent loose connection.
Has anyone else had this issue?