The contact owns a 2014 Chevrolet Silverado 1500. The contact stated while driving approximately 50-65 MPH, the vehicle jerked and downshifted unintendedly. The contact stated that the vehicle experienced hard and erratic transmission shifts while driving. There was no warning light illuminated. The dealer was not notified of the failure. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 130,000.