Juddery picture on S1 Tivo
We have an original Tivo from 1999 that we recently upgraded to a 1TB disk and a 500MB cache card. It's receiving its signal from a Freesat box via satellite. Tonight it started juddering and having picture break-up. Worryingly, it had it both on playback and watch live TV. Even playing back shows that were fine earlier today. I did a restart and even the restart animation came back juddering. Weirdly it looks like digital interference, but it can't be.
Help! What's gone wrong!