They're clearly not that bothered about this issue. It's obviously not affecting a large enough percentage of their subscriber base; you can bet your bottom dollar that if the clamour was loud enough they'd do something about it. Personally, I find it incredibly irritating. Friends and family come round to watch HD football on the projector and are blown away by it, only to have the whole experience compromised by the sound issue. "Why does the sound keep going?" etc. Very annoying!