2014 NISSAN ARMADA Electrical System Problems

I BOUGHT MY VEH ON 2/7/18 AFTER PURCHASING AND GETTING HOME SEVERAL DAYS LATER WHILE DRIVING DOWN THE HWY THE LIFT TAIL GATE STARTED TO OPEN AND MY DASHBOARD STARTED TO DING BUT THERE WHERE NO WARNING LIGHTS. I HAD TO PULL OFF HWY REALLY QUICKLY TO DEAL WITH THIS ISSUE. THEN AGAIN ON 2/20/18 THE LIFT GATE DID THIS AGAIN 2 TIMES WHILE DRIVING DOWN THE ROAD. WENT TO DEALERSHIP AND THEY SAID BEFORE THE SECOND INCIDENT IT WOULDN'T HAPPEN AGAIN. THIS HAS SCARED ME BOTH TIMES OF HOW DANGEROUS THIS IS. I HAVE TURNED THIS INTO NISSAN TWICE AND HAVE STILL NOT HEARD FROM ANYONE WHEN IT WAS TURNED IN ON 2/14/18. I HAD THE DEALERSHIP CHECK THE VEH ON 2/13/18 AND THEY FOUND A DEFECT IN THE BAR THAT OPERATES THIS LIFT AND ALSO A SENSOR ISSUE THAT CONTROLS THE ELECTRICAL FUNCTION AND ALSO A DEFECT IN...