Calling sometimes does not work

Help Fairphone 3
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Hello everybody,
I have the problem that I cannot make calls with my FP3. A connection is established but you cannot hear anything and you are not heard. If the FP3 is restarted it will work again. Does anyone know the problem? How can I solve this problem? greetings
hanswernerolmolm

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2 posts were merged into an existing topic: No sound during some phone calls