The contact owns a 2018 Ford Expedition. The contact stated while driving at an undisclosed speed, the transmission unexpectedly downshifted without warning. The transmission also shifted hard, and the vehicle jerked while driving at various speeds. There were no warning lights illuminated. The vehicle was taken to the dealer who diagnosed the vehicle with transmission failure. The transmission was rebuilt. The following day while driving approximately 65 MPH, the transmission shifted hard, and the contact became aware that transmission fluid was leaking from the vehicle after exiting and inspecting the vehicle. The vehicle was towed to the dealer who diagnosed the vehicle with transmission failure and replaced the transmission. The contact stated that the transmission still shifted hard while driving and the message that the engine was overheating was displayed. The vehicle was returned to the dealer who had rebuilt the new transmission. After having the third repair, the failure recurred. The vehicle was returned to the dealer but was not yet diagnosed or repaired. The manufacturer was informed of the failure. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The approximate failure mileage was 60,000.