Microphone stopped working

Hello. Since a few time I had troubles with my microphone. When people called me or I called them, they couldn’t hear me while I could hear them. I was puting of the battery and rebooting the phone and then it worked again. Now it stopped working for real. I don’t get why. I tried to update and to see if the pieces were well positionned inside. Do you think I should buy a new microphone?

Thanks for you help!

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