Audi A8 2009 Partial Soundbar problem

AlexOvi

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Hi Guys, I have a problem with my father's 2009 A8.

When playing radio, all the Subs at the bottoms of the doors work, the tweeters on the back seats work but the front soundbar (next to the windshield) tweeters won't.
However, while on-call over Bluetooth the front tweeters work. After the call ends the radio starts again the soundbar tweeters won't make a sound.
And no, the speaker balance is all at the middle or other audio settings from MMI are fine.

From this, it looks like it is a software problem.
What can I do? Could VCDS Help?