We'll have to do some actual studies, but this, along with a host of other technical issues are really getting on our nerves.
We're going to try using the phone key only for about a week and then try using just the key card only.
We actually had a friend enter our car after we exited the vehicle, she was trying to turn the music off. That was the first time that we noticed that the auto lock wasn't working properly. Every since then, we've noticed that it hasn't worked over a dozen times. No notification or anything, just music playing and the screen stays on...
Very frustrating.
to be fair, it's "walk away lock" not "exit the car lock." it won't actually lock until you walk far enough away that it no longer recognizes the key. just exiting the car and standing next to it isn't good enough, IIRC.
music and the screen staying on with nobody in the car though is a different issue...i've never seen that.