Hello I just recently bought a certified 2014 silverado 1500 with 80k miles and only had it a month every now and then when I backup at a angle my steering wheel will lock up and my whole truck will shut off and it want turn over until I open door and close it. And it doesn't do it all the time I called the dealership and they didn't know and its only been when I reverse it and it happens every now and then if anyone else have had this problem or know the fix?