Well, this is getting weirder. The box changed to channel 0 during the night in the week, it had been on Sky Mix which I don't think stops during the night, and even if it does, it should switch to 7 yes?
We've also still got the button delay thing. Last night it was a good 10 seconds between pressing up and it actually changing up which a reboot wouldn't fix. Went on for a good few minutes around 9pm ish. The interactive is also worse than useless at the moment - everytime you press the button it either says "please wait" and nothing happens or displays the first page then freezes and needs a reboot.
I think another call might be in order