elevator was installed in august 2018. i was impressed with the installer kenny cloughley from harrisonville mo area. loved it until a month ago as it got a few inches from floor it just dropped and the door would not open, called 911 and fire department was dispatched to my home. they were on the phone with mike b in harrisonville who talked them through opening the door. he thought the problem was with the limit switch which he had them install a small thin metal washer under the limit switch. in testing it seemed to work fine, BUT now a month later it happened again but i was testing the operation before i got on it and i heard it FALL at about the same point. what is the permanent fix so i can again trust my elevator that i thought i loved.