The contact owns a 2019 Ford F-150. The contact stated while driving between fourth and fifth gear, the vehicle experienced hard transmission shifts. The contact stated that the failure increased progressively while driving. The contact stated while driving at various speeds and exceeding 4th gear, the vehicle experienced an unintended transmission downshift to first gear, and the engine revved to 5000-6000 RPMs even though the accelerator pedal was released. Additionally, the rear wheels locked up. The contact was able to pull to the side of the road and parked the vehicle. The contact was able to resume driving; however, the failure recurred several times while driving. The power train warning light was illuminated, and the message