Question Why can't the person on the other end of a call hear me but I can hear them?

Apr 14, 2019
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I have an LG K7 for some reason no matter it be an incoming call or a out going call, sometimes at first the person on the other end can hear me but within just a few seconds they can't hear me at all... Even if I use speaker phone. Video calls too... I can hear them perfectly but they hear nothing....please help me fix this problem...I'm missing important calls about possible job opportunities.