I have this too. It didn't do it until I hooked everything up to my AVR. When I power everything on via my Harmony One, it cycles through turning on the receiver, TV, etc. Mine disappears when the screen "resets". Its not that it fades away after "Onkyo" and "Viera" logos are up, the screen literally refreshes after everything is powered on and goes to a completely black screen. A split second later the cable and or blu ray is ready to go.