Why can't I hear on calls?

[AC Question]

Can't hear them nor they hear me

I have a Samsung S3 4G (I9305), and my problem is that I cant hear the one who called me, neither can they hear me. Same goes if I call them. I got this working after I manually updated my phone to KitKat 4.4.4, since my phone is rooted. But after a while the same problem came back. Anyone have solutions?