2015 Chevrolet Suburban stability control problems

For the 3rd time my wife while driving her car had these issues! Service power steering where it makes it hard to turn. Brake and ABS lights come on making the brake pedal go to the floor barely stoping the suburban, service stabilitrac and service trailer brake! This is the second time it's at the dealer the first time it went away so quickly we thought it was a fluke but it definitely scared my wife to death! By the time we get it to the dealer it clears it's self and they can't find anything wrong!

When turning into parking lot today at low speed, electrical system went crazy, screen flashed power steering failure, stabilitrac failure, doors locked and unlocked and engine died. Restarted and was fine driving forward and repeated failures again when turning to park in parking space. It is fortunate this was in a parking lot and not on interstate or other main road or while turning at a traffic light.