Sounds like signal. The problem with Digital is that its... err.. Digital. Its on or off - one or zero. You either get a signal or you don't.

If you don't get a signal then there is none of this fuzzy picture or ghosting malarkey that you used to get with Analogue... No... You simply get NOTHING.

I have a similar issue with my main TV. When the weather gets bad my freeview box cant pickup a strong enough signal on some channels even though I have a roof areal now.

So - digital is great when you have a signal, but poops when you don't ;-)