I am having the same problem with my MIB3 radio as others are having. Turn on car and no sound. I can switch to other radio stations, FM or AM, or even My Media - no sound. I turn the radio off/on. This does not correct problem. I turn my ignition off/on, this does not correct problem. The only thing that works is a manual reboot - press and hold volume button for 12 seconds - the radio reboots and then works fine.
It was taken to the dealer and their inspection showed radio working as designed, with all the latest software updates.
There has to be a fix for this problem. Does anybody know if VW is working on a software fix?