My phone is muted when I answer a call.

So I've had my phone for over a year now, and I've noticed recently that when I answer a call I can't hear the other person at all. They can hear me, but I can't hear them. If I turn the speaker phone on and then turn it off it works normally. Sometimes the screen goes completely black and I can't do anything but hang up. This also happens when I make phone calls. If I hang up and call again, it usually works fine though. Any suggestions?

Same boat here plus. Wasn't hearing anyone, speakerphone worked fine. Decided to get new ear speaker, and replace scratched up digitizer at the same time. seeing many flex issues got a new flex and LCD. (was a deal in a combo) Now I get a blank screen. with either lcd or flew.. Thinking only one thing left, and that's the main board.

recap replaced digitizer, ear piece, lcd and main flex. blank screen, and still no sound from ear piece.