I guess alarming was a little bit much I have never had to reboot a normal car though - i get the tesla is far more complex but that sounds a little jaguar/landrover flakey to me!
I've certainly had to reboot the infotainment system on my Audi A6, Audi A4 and Skoda Kodiaq at least once in each of their ownership. Mainly either when it locked up or Bluetooth wouldn't connect.