Sounds to me like these guys are actually experiencing the UEVD issue rather than any call volume problem: http://xdaforums.com/showthread.php?t=352906
Thanks drokkon that was an interesting thread. The Volume of the phone is not a problem. It rings , it announces emails and texts. The alarm works. You never have to touch the volume. It is just on some incoming calls, the phone rings, I answer the screen shows connected, the little connection vibrate happens just no sound on the call. You then call out, still no sound 'til a soft reset solves the problem for now.