AS I WAS GETTING SOMETHING OUT OF THE TRUNK AREA WHILE STANDING AT THE CENTER REAR BUMPER, THE LIFT HATCH STARTED COMING DOWN ON ITS OWN. IT WAS SO QUIET I DID NOT HEAR IT, AND WHEN I STOOD UP (I'M 5FT 1-77 YR OLD FEMALE, I STOOD STRAIGHT UP AND MY HEAD BANGED INTO THE LID WHICH WAS ON ITS WAY DOWN. THE FORCE OF IT HITTING MY HEAD CAUSED IT TO START ASCENDING BACK UP. I LATER WENT TO EMERGENCY ROOM BECAUSE OF MY HEAD BRUISE AND PAIN. SCAN REVEALED NO INTERNAL BLEED BUT WAS ADVISED TO TREAT IT LIKE A CONCUSSION. I SHOULD NOT HAVE TO PAY THESE EMERGENCY ROOM BILLS FOR A DEFECT AND NOW I'M PARANOID ABOUT THE LID. WITH ALL THE BEEPS ON THESE CARS, THE LID DEFINITELY NEEDS A WARNING WHEN IT IS COMING DOWN.