The contact owns a 2019 Ford F-150. The contact stated while driving at an undisclosed speed, the transmission independently downshifted. The contact stated that several unknown warning lights were illuminated. The contact stated that the failure had occurred several times, and the failure became a persistent failure. The vehicle was taken to the dealer where it was diagnosed with transmission failure. The contact was informed that the transmission needed to be replaced. The vehicle was repaired. Additionally, the contact stated that the vehicle had been taken to the dealer several times due to the failure, and the dealer updated the software and made some technical adjustments. However, the failure reoccurred. The manufacturer was made aware of the failure but provided no assistance. The failure mileage was approximately 57,000.