mobile

Hey guys, when I'm in a phone call the other person can't ear me properly, I can listen him just fine but he says there's a lot a strange noises and my voice is weird, the problem occurs with everyone. I already tried to update/change the bootloader and the modem but the bug persists, I'm running a custom Sammy Lollipop rom, but I had the same problem with Temasek CM12 builds. Any Idea ?

Thank's in advance