hi just wanted to update all that I have received the new replaced unit of SR5009.
unfortunately the audio drop issue is still there as same

But this time, i do not want to complain the AVR as I believe there is something else than blaming it on the AVR. May be HDMI handshake issues or old firmware in my LG LED TV.
Will continue to keep testing and workarounds and see if some magic happens at some point of time...