yes, there was a recent thread on this that I started, as my 06 was doing that too. It has something to do with the car sensing you've walked away from it and securing itself, but it hasn't done it since. Just a couple of times. This car is alot like a Nintendo game, all sorts of hidden buttons and sequences to get to the bonus points. Look up slef-locking on the threads and you'll find the recent posts, form about Sept or so.