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.
				
			
				
		