Steering Wheel Vibrate problems of the 2017 Chevrolet Colorado

Tl the contact owns a 2017 Chevrolet Colorado. The contact stated that while driving at slow speeds, the transmission downshifted without warning. The contact also stated that while traveling at a high rate of speed, the steering wheel vibrated abnormally without warning. The contact took the vehicle to chuck hutton Chevrolet (2471 mt moriah rd, memphis, TN 38115) where the mechanic was unable to duplicate the failure. After the failure persisted, the contact took the vehicle to jim keras Chevrolet (2000 covington pike, memphis, TN 38128) where the transmission fluid was flushed and temporarily corrected the failure however, the failure reoccurred after several thousand miles. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was 21,000.