I have two zap timers set, neither of which seem to be doing anything.

The first zaps to ITV HD every morning at 0530hrs. The second zaps to Sky News every morning at 0555hrs. The object of the exercise is to delete the old timeshift buffer and create a new one every morning so that I don't eat up vast amounts of HD space, and also to buffer up enough of Sky News so that I can watch from the top of the hour whilst I eat my breakfast.

Zap timers used to work and Sky News would be the current channel at breakfast, all nicely buffered, no matter what channel my Mut@nt HD51 was left on the previous evening. Then, unexpectedly, they stopped working. Now I can't get them working no matter if I change the time of the timers or the channels they zap to.

I have no cron timers or power timers. These are the only zap timers. All other timers are either one off timers or auto timers that zap and record; these seem to work fine.

Does anyone have any suggestions?