Something strange happened the other day!!!
I was watching ITV1 on my digital TV the other day when all of a sudden there was some sort of signal interference with sound failure and little squares popping up on the screen. I checked the wiring and connections and found no problem - even checking the aerial socket and no joy. I even changed the wiring from the wall to the DVD player, still no joy!! Then I realised my phone wire was within an inch of the TV cable and causing intereference. So i rerouted it and all is well.
I didn't realise broadband signals could interfere with digital TV signals. As you have to have a phone link to the sky box its worth rerouting the cable away from any TV wires!!