I posted this yesterday, but the board appeared to be down.
I had problems with my old Sky box and it was replaced yesterday morning. It's an old (refurb) box and also has the old pre-HD EPG. A couple of interesting points:
1) No blue lines on any TV channel. This is a particular dislike for Simon, but using this Pace box and old EPG, not a single channel has any blue lines down the side of the screen.
2) So far....no BV7-40 MKIV crashing, which somewhat suggests that it was related to the new HD EPG. Unfortunately the Sky engineer has told me there's no way to stop this box auto-updating to the new EPG, which will happen sometime over the new few days. But, for now at least, no TV crashing!