Hate to bump this, but better than making a new thread...
Wife called me (as soon as I got to work today) and said the car locked itself while she was warming it up. Once I got home, I got in the car and checked the options to make sure the autolock feature that disables the locks if the key is in the ignition was checked, and it was. Thing is, it only works when the driver's door is open. I tested it with both keys, with the car running, and not. Door open, hit locks, doors lock then unlock. Once you close the door though, they lock and stay locked.
So if you're lost on this (like I am), somehow the door locked after she closed it, while it was running. I know the anti-lock feature works, because I've tested it. I had to come home from work and unlock with the key blade because the fob wouldn't unlock it.
I'll take a look at the option again to make sure I have it set right, but it seems to be working correctly when the door is open. Just wondering if anyone has had this issue, and it seems some people have, but I haven't seen it happen with a running vehicle before.