The contact owns a 2015 Ford F-150. The contact stated that while driving approximately 70 MPH with the cruise control activated, the vehicle independently decelerated while driving next to other vehicles. No warning lights were illuminated. The vehicle was taken to a local dealer where unknown repairs were performed. The vehicle was repaired; however, approximately 7 years after repairs the failure reoccurred. The vehicle was taken to the same local dealer where unknown repairs were made. The manufacturer was not made aware of the failure. The failure mileage was approximately 25,000.