[Q] Callers cannot hear me

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http://forum.xda-developers.com – Purchased an S3 (i9300) in October - 4.0.4 ICS Rooted Flashed CWM Touch 6.1.2 Updated ROM to stock UK ROM - JB 4.1.1 On both the ICS ROM and the JB ROM I had a problem with call volume fading during calls. I can hear the other end perfectly on both speakerphone and normal, but........ about once every 6 minutes for 10 seconds the call recipient says my voice becomes indistinct to the point of not hearing me. Bluetooth headset doesn't help. It doesn't matter whether I call them or they call me. I have 5 bars of signal on my phone and it happens when I'm calling a fixed line phone (HowTos)