I've had my MDI lock up a couple of times now. On one occasion the iPod continued to play (and move to the next track in sequence), but no amount of button pressing would change tracks or affect playback, and the display wouldn't update. The other time, the music just stopped, and the MDI refused to accept any commands, update the display, etc etc. On both occasions, the iPod remained responsive (although my iPod has locked up on its own plenty of times too).
On both occasions, leaving the car with the iPod unplugged and the ignition off for 20 minutes gave the MDI time to shut down and hence be restarted, and all was okay subsequently.
Maybe Maverick knows of a way by which you can reboot the MDI (or the headunit - RCD-510 or, in my case, RNS-510) without having to wait the requisite 20 mins?
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