I have an 06 S with the factory bosé system. Here's my issue...

when listening to a cd from the single in dash slot, after I turn the car off and then go back out at any point... the cd has advanced about a song and a half.
I can't say for sure if it does it every time or not but it seems like it.
Alos, I always power down the stereo before turning off the car. I thought maybe it was still playing temporarily after I left the car but I don't see how.

-mark

 

The MOST bus takes a while to actually shut down, I believe sometimes a couple of minutes. I've noticed the same and when configuring my Dension, I have to lock the car and wait a couple of minutes to allow the system to fully reboot.