NHTSA Complaint #11092015 — 2014 GMC TERRAIN

I HAVE A 2014 GMC TERRAIN SLT THAT WHEN THE LIFT GATE IS OPENED IT GOES ALL THE WAY OPEN, DROPS CLOSED ABOUT 1/4 OF THE WAY AND THEN OPENS FULLY AGAIN, THEN WITH POWER CLOSES-SLAMS SHUT. THE FIRST TIME IT HAPPENED 3 DAYS AGO, IT HIT ME IN THE HEAD AND KNOCKED ME TO THE GROUND. I CALLED DEALER WHERE I PURCHASED IT FROM AND THE TECK THERE SAID THERE WERE NO NOTED PROBLEMS OR RECALLS FOR THE "TERRAIN" MODELS AND I SHOULD COME IN AND JUST HAVE BOTH THE LEFT SIDE ACTUATOR AND THE RIGHT SIDE GAS STRUT REPLACED. THIS INITIALLY HAPPENED IN MY DRIVEWAY WITH THE CAR IN PARK AND ENGINE OFF. HAS ALSO HAPPENED WITH THE CAR IN MY DRIVEWAY WITH ENGINE RUNNING.