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Pixelating picture and sound?

I have a Thompson freeview box 160gb version and since the digital switchover, the picture continues to pixelate and the sound is jumpy, so unable to watch or hear properly.....
anyone know of any solutions, except to buy a new box. I have tried a neighbours freeview box and it works fine, so wondering if the box has just had its day !!
Carole, November 2011