The contact owns a 2017 Cadillac Escalade. The contact stated while driving at an undisclosed speed, the vehicle lost motive power. There was no warning light illuminated. The vehicle was able to be restarted. The vehicle was taken to the dealer where it was diagnosed and determined that the rocker arm, crankcase, and the overhead valve needed to be replaced. The vehicle was repaired; however, the failure recurred. The contact stated that while driving at an undisclosed speed, there was a misfire coming from the engine. There was no warning light illuminated. The vehicle was taken back to the dealer but was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 50,000.