2017 GMC SIERRA Steering Problems

WHEN I'M DRIVING AT A SLOW SPEED TURNING THE TRUCK LOOSES ALL POWER AND THE STEERING WHEEL JERKS OUT OF MY HAND, STABILITRAK IS ON THE DISPLAY AND IT SAYS ROLL DOWN DRIVER WINDOW AND ROLL BACK UP! IT ALSO LOOSES ALL POWER JUST DRIVING DOWN THE ROAD NO MATTER THE SPEED! I HAVE ALSO BEEN STOPPED AT A STOPLIGHT AND IT LOST ALL POWER WOULDN'T COME BACK ON SO I HAD TO GET OUT POP THE HOOD AND BANG I. THE BATTERY BOX AND CABLES AND IT STARTED AGAIN! VERY SCARY GOING 75 MPH AND IT SHUTS OFF LEAVING YOU NO STEERING NO BRAKES NO LIGHTS NO NOTHING! SOMETIMES IT SAYS POWER STEERING FAILURE SOMETIMES AND SOMETIMES IT SAYS STABILITRACK PROBLEM AT SOMETHING ABOUT TOWING! THE BRAKES WERE ALSO AFFECTED NO BRAKES

THE STABILITRAK SENSOR KEEPS GOING ON AND OFF. I'VE HAD THIS ISSUE WHEN I FIRST GOT THE TRUCK IN THE END OF OCTOBER IN 2017. THE DEALERSHIP COULD NOT FIX IT AT FIRST BUT FINALLY HAD TO FIX SOME WIRING. I'VE SEEN IT GO ON A FEW TIMES SINCE THEN BUT NEVER STAYED ON. AND FOR ABOUT 2-3 WEEKS IT'S BEEN COMING ON AND OFF BUT STAYING MORE ON AND NOT GOING AWAY NOW. I FEEL LIKE THIS SHOULDN'T HAPPEN TO A NEWER TRUCK

VIBRATION 65+ MPH, FELT IN STEERING WHEEL AND SEAT. STEERING WHEELS QUIVERS AT 65+ MPH. TRUCK FEELS VERY UNSTABLE AT HIGHWAY SPEEDS. DEALER STATES IT'S NORMAL.