If I have a dvd in the drive of my Z1 it will play in the background while listening to music. In other words when I start the car the dvd continues to play even if I am listening to XM or FM. If I turn off the car and the dvd is at 30 minutes of playback and then start up the car again later, drive for 15 minutes while listening to music and then switch back to dvd it is now at 45 minutes, not where I stopped it (30 mintes). Does anyone now how to prevent this from happening?

On the main AV screen (with all the buttons on there) on the right side there is rear screen, which can be Mirror, AV or DVD. You have it on DVD, which assumes there is a rear monitor hooked up and your kids back there want to watch a dvd while you do something else on the screen, so it keep playing. Put the rear output to mirror and when you switch off the DVD it will stop playing.