Hi, I seem to have lost a lot of my channels (Sky 1, most movies, etc). They can still be selected but no picture will come up. On some channels the picture will start, play for a few seconds, then freeze. I've checked the connections, which all seem to be good and the dish doesn't seem to have moved (Still solid!) I've checked the menu system and the signal strength is steady at half (always been there) but the signal quality is fluctuating wildly. Any ideas what this could be? Is it a new digi box? If so, what type do you recommend, and would you trust the boxes off EBay? Cheers, Darren.