Mmi suddenly stops working

Repeat

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May 13, 2021
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Örebro
Hello!
I recently bougt me a a6 c6 -07 and when driving there can be a crackling sound or a pop from the speakers. After that the mmi screen freezes and the sound goes away for a few seconds to a few minutes, and then the mmi reboots. And this just goes on and on..
Any idea what is can be?
Iv'e reseated the cables and connectors with no success..
It's mmi 2g low