On point 1, is you box shutting down or are you just losing the picture, what i mean by that is can you still get the Sky menus, TV Guide etc, or does the whole thing just die? The reason I ask is that a lot of Sky HD boxes are failing with the new software that has been downloaded but the symptom is no satellite signal message but still menus to navigate.
The TV crashes, not the Sky box. I've not experienced a scenario where I can't control the Sky box and the TV should still operate, even if the Sky box did crash.
The Sky box is fine and can still be 'controlled' via the Sky controller, if necessary. What's happening is that the TV intermittently seems to start to mute the signal, then the picture fragments, then the entire TV crashes and won't respond to the remote. The only way around that is to turn the mains off and power up the TV again. I've attempted to take the cables out and put them back in to the TV, thinking it might be a cable fault (unlikely).
The Sky box is is only connected via HDMI and the TV doesn't crash when watching DVB-HD, internal Blu-ray or any other connected device (ie. PS3).
The 'good' news is that the TV is crashing far more infrequentely than on Thursday. It can go a whole hour or more (!) before it crashes. If also found that I can stop it crashing by moving to DVB-HD (ie. away from Sky) when the picture starts breaking up, then back to Sky. There's about 10 seconds or so before it crashes.
I'm starting to think it's some kind of HDCP issue.