I had three problems
the first one is resolved with the firmware software update which is sound lost while watching ..
Other problems are
tv has no picture after start up
and tv does not react to remote control after wake up
The latest firmware updates its mentioned about them but nothing is changed..
(Q5521_0.140.39.0 (Date published: 2011-07-27)
I was install it but I still restarted my tv everytime then picture coming...
Anyone who cares about it?