When I first got the car, the walk-away feature was able to be slid to the on position. Then I noticed my car wasnt locking. Tried to slide it to the on position, but it wont stay there.. slides right back to off. All the other options onthe page work -- I have played with all variations to try to get it to work. No avail. I have reset the screen. Still doesnt work. Anyone else experiencing this? (I have called Tesla - -it has been 3 days - no reponse yet). Must be a software issue??