Microphone doesnt work on phone calls sometimes

It happens sometimes on my Sony Xperia Z5 Compact.
Microphone seems deactivated on my phone, no probs hearing the other person.
After a restart it works again.
Any ideas if its something I can do about?
Havent found something on the forum…
And not sure this is the right place to post this, but I am a little overwhelmed by the structure of the forum to be honest…

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