Our Tivo box has just started showing pixellated pictures and the sound drops out. This is worse on HD channels. Sometimes the channels themselves are not available at all - e.g. Eurosport 1 (SD) and Film 4 (HD). The error message says to call 150, which I've done but that tells me there are no problems!
I have reset the box twice and have checked all the connections and they're all fine.
Tonight Film4 HD was intially a little bit corrupted, then unwatchable, then unavailable.
Checking other channels showed corrupted picture on every single one, but significantly worse on HD channels.
This is all 'live' TV, although recordings also show the picture corruption and sound dropouts.