Sky+ HD planner/Anytime problem?

Hi there

Suddenly developed a few faults on my Sky HD box (2 year old Thomson model) - When trying to view anything from my planner or from Anytime the picture just freezes and then stutters along, the same problem occurs if I pause/rewind live tv and then try playing it again. The EPG has also become painfully slow to respond.

I have tried a Sky+ Rebuild and also a full System Reset but neither have solved the problem. Any ideas gratefully received - not looking forward to forking out £200+ for a new box!

Thanks