The contact owns a 2021 Freightliner M2. The contact stated while driving at various speeds and slightly depressing the accelerator pedal, the pedal travelled down to the floorboard and was stuck, causing the vehicle to accelerate unintendedly. The contact depressed the brake pedal, but the vehicle failed to respond. The contact shifted to neutral(N), pulled over to the side of the road, and turned off the vehicle. The contact stated that upon restarting the vehicle, the vehicle operated as needed temporarily. The contact stated that the failure had caused him to pull over to the side of the road several times in one drive. The contact stated that the failure had been recurring intermittently. The contact stated that while driving 40 MPH, the failure recurred, and the vehicle accelerated unintendedly to 70 MPH. The contact stated that the vehicle was taken to the dealer several times. The dealer test-drove the vehicle and informed the contact that the failure could not be duplicated. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 15,000.