Default Skype mic not working

Hi..i have this LG G2 (D802) for about 3 months..and I always had a problem with skype voice call or fb messenger voice call..when i call someone on skype(or i'm called) i hear that person but that person can't hear me... on facebook messenger, when i call somebody like 6 seconds its saying "connecting" but i can hear that person but he can't hear me..and after that 6 seconds the call is automatically closing

I have the official firmware europe 20D rooted.. some help?