I rarely use it in full screen mode so it's almost always in window mode. It does seem really glitchy compared to the one in Vista, i.e. it's restarted on me 3 times already today.
I'm not sure where to even begin to look for a solution as i'm pretty sure it's the media centre application itself.
I also get the same thing when I go from full screen mode to window mode, that's not really too much of a problem, but this constant signal loss is unbearable, as I quite often switch to open a website or do something else and the noise from the breaking signal and ultimate loss is really annoying.