Ended up taking it back to the dealer today, and they verified the auto unlock was not activating correctly. Not sure exactly what they did to fix it, but I was told the computer module needed to be reset - whatever that means. I'm just happy it's back to the original setting where the doors unlock when the engine's turned off.
Now I can move to bigger and better things... like maybe putting some speakers in the back so I can actually use that 'fader' button
