1-Rear driver-side Power Lift-gate actuator ball bolt snapped right off while rear gate is open. 2- It came right down on my head and caused severe bump and bleeding from a 250 pound rear door. I am 6ft 1 in, but if it is someone small it can cause sever injuries and possible death from the heavy door coming down on the person. 3-problem was looked at by my mechanic and they cannot fix issue as bolt broke off inside the thread area and no room to remove such bolt. They recommended I take it to a body shop to cut the area out in order to get the broken broke removed. 4-unknown 5- There was no signs of any failures at all.