The contact owns a 2020 Ford F-150. The contact stated that while driving approximately 50 MPH, the vehicle was hesitating and downshifted unintendedly. The contact stated no warning light was illuminated. The contact stated that the failure was intermittent at first but had become a recurring failure. The contact stated that he had taken the vehicle to a dealer and was advised that the failure could not be duplicated. The vehicle was not repaired. Additionally, the check engine warning light was illuminated while the transmission was downshifting. The contact had taken the vehicle to the same dealer who diagnosed the vehicle and determined that the long block and the transmission needed to be replaced. The vehicle was repaired. The manufacturer was informed of the failure but advised the contact that the vehicle was over the mileage for the warranty and not covered. The failure mileage was approximately 72,000.