The contact owns a 2019 Ford F-150. The contact stated that while driving 5 MPH, the vehicle unexpectedly downshifted to 1st gear, prompting the contact to discontinue driving the vehicle. The vehicle returned to normal functionality, but the failure became a regular occurrence. No warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the adaptive drive system, resulting in damage to the transmission. The contact was informed that the transmission needed to be replaced. After investigating the failure, the contact related the failure to NHTSA Campaign Number: 24V444000 (Power Train); but the VIN was not included. The manufacturer was notified of the failure, a case was opened, and the contact was referred to the NHTSA Hotline for assistance. The failure mileage was 90,000.