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Proximity sensor muting calls

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Hi,

So when making a call the other person can't hear me or hears me very low. I figured out that if I move my face away from the proximity sensor the mic works normally. The fact that some people say they can hear me very low could mean that one mic at the top of the phone is not affected.
Is there a setting anyone can suggest or a way to reset the settings without doing a factory reset.
This might have happened after a recent update.
Thanks.