Lose Power Steering problems of the 2015 Chevrolet Trax

Check engine light came on while driving city streets and there were no other symptoms. It was intermittent. Took car to the dealership and they fixed some loose computer connectors. Two weeks later check engine light came on. Stability control off light came on. At one point lost power steering and the dashboard display including speedometer zeroed out for a few seconds while driving city streets. Driving on the highway the car got to 4000rpm without properly shifting for the entire drive. Took car to dealership again and they fixed a different loose ground connection for the computer. On the drive home in city streets the check engine light came on intermittently and the stability control off light came on. Engine would not shift into a proper gear and drove at close to 3000 rpm instead of the 2000 usual rpm. Rear view camera would not function.