Speed Control Cable problems of the 2018 Tesla Model S

I drove to work on may 2, 2019, and was trying to park in my allotted parking stall on the 3rd level of my office parking garage. My parking stall was along the outer edge of the garage and the only barrier to the outside was a set of three (about " diameter) cables strung between outside columns of the garage, besides a thin perforated corrugated metal sheet outside the cables, acting as a rain stop. I was trying to slowly turn right from the parking aisle to park between two pickup trucks on either side of my stall. When I had turned partway into my stall, my Tesla suddenly accelerated into my parking stall at high speed, hit the outside cables, rebounded backwards and stopped about 10 feet from the outside cables. The cables saved me from plunging 3 floors down from the garage. There was extensive damage to the hood and front portions of my Tesla. There was also some damage to the metal corrugated sheets outside the cables and a slight dent on the corner of the vehicle parked to my right. I have been parking in my office parking stall for about the past six months without any issue like this. I want to know why my car accelerated like that without warning and why the collision warning system was not triggered by the outside corrugated metal sheet. Also, there was an issue with my Tesla the previous evening. When I tried to start my Tesla after work, I got the 'systems are powering. . ' message on the screen and my car would not start even after a long wait. Then, I had to google to find a way to reboot the car computer, by pressing two buttons on the steering wheel. On the day of the accident, I used the intermittent rain sensing wipers for the first time, as there was a light rain. My car is still in the body shop waiting for some back ordered parts. I have asked Tesla to do a diagnostics to see if there were any software bugs in the system.