my 2023 Cadillac Escalade vehicle broke down while I was driving on the highway this past Wednesday. While driving at highway speeds, the transmission unexpectedly shifted from Drive (D) to Neutral (N), and after that, I was unable to shift back to Drive or start the vehicle. The car was then towed to Cadillac of Silver Spring in Maryland for further inspection. I was informed the engine may be locked, but other technicians suggest it could be an ECM or electrical issue. The vehicle is still under warranty and only has 12000miles.