Calling issue

So as the title says recently I have been encountering this issue of reception/call.
When I answer some calls, the person can't hear me but I can hear them fine and they hang up they call again its working.

It was working fine before on 2G network, now I chose 4G preferred/3G/2G but it still persists.

D6503
23.4.A.0.546
5.1.1
Stock ROM
Rooted

Any ideas on how to fix this will be greatly appreciated.
Thanks:D