THE BACK GATE COMES DOWN ON YOUR HEAD WHEN YOU ARE TRYING TO PUT THINGS IN BACK OR TAKE THINGS OUT, ALMOST IMMEDIATELY. IT HAS HIT MY HEAD SEVERAL TIMES CAUSING IMMENSE PAIN AND A MIGRAINE. IT STARTED IN JULY OF 2019 AND WAS SLOW AT FIRST. NOW IT HAPPENS ALMOST IMMEDIATELY.. IT HAS HIT MY HEAD SEVERAL TIMES AND MY SON. I SAW THERE WERE PROBLEMS WITH THIS MODEL WITH THIS ISSUE. GMC TELLS ME IT IS NOT COVERED.