The contact owns a 2019 Ford F-150. The contact stated while driving at an undisclosed speed, the transmission unexpectedly downshifted, dramatically reducing speed of the vehicle before returning to normal functionality. The vehicle returned to normal functionality, but the failure became a regular occurrence. No warning lights were illuminated. The vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired. 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 not notified of the failure. The failure mileage was 67,000.