my dtr is reporting corrupt recordins and messages show associated serviceo?

I have the same problem as Lynne White except it only does it for itv and nor bbc recordings. I retuned my box and then messsages say my recording has been cancelled as the associated service is no longer available. I don't know what this means or how to slove it. If it was the capacitors, it would fail to record all programes wouldn't it??? Help please, autumn is the best time for new programmes