Some times people cant hear me during long phonecall

I have a Galaxy A3, and my phone has a perculiar problem

When i have spoken in more than 6 minuttes, somtimes people say that they cant hear me. Only when i use head set there is never a problem.

I have reinstalled the system. I have swiched sim card. I have allso run the phone in safe mode and here the error still appears.
I went to the repair shop and got at complete hardware test showing no errors. They allso did a completet deletion of the phone and installed new system software.

Non of this has helped.

Are there more things i can try to get rid of this bug.

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