The contact leased a 2022 Mercedes-Benz AMG SL55. The contact stated while driving approximately 55 MPH, the vehicle unintendedly decelerated and stalled. There was no warning light illuminated. After restarting the vehicle, the vehicle operated normally and was later driven to the residence. The vehicle was then taken to the local dealer who was unable to determine the cause of the failure. The contact stated that the failure had occurred on another occasion and the vehicle stalled and was restarted. The vehicle was later towed to a different dealer who diagnosed the vehicle with engine misfire. The contact was provided a loaner due to the failures. The cause of the engine misfire was not yet determined. No further information was available. The contact had experienced extreme mental distress caused by the engine failures. The manufacturer was notified of the failures, but no assistance was provided. The failure mileage was approximately 10,000.