First off im Running Nexus S on the latest MIUI build. I noticed that once you leave your main phone call screen while still on the phone, the phone will automatically mute so the user on the other end will no longer hear you but you can stil hear them. The sound comes back once you return to that screen. I've tried reflashing a couple of times but it still stays the same. Can anyone else reproduce this or confirm it or is it just me? thanks.