2023 Ford Bronco brakes problems

Emergency brake failure. I have a very slight slope on my driveway. My car rolled halfway down my driveway. I assumed I did something wrong although I knew I had the car in gear with the E brake on. Two hours later I came back from an errand parked on my driveway was sitting in my car and my car started rolling backwards. The car was off in gear with the E brake on. I videotaped this happening every 20 seconds the car with balance, and roll back an inch or two.

The contact owns a 2023 Ford Bronco. The contact stated that upon starting the vehicle, the message "Parking Brake Fault - Service Now" message was displayed. The vehicle was taken to a local dealer to be diagnosed; however, the contact was informed that further diagnostic test was needed to determine the cause of the failure. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 33,990.