This problem has just randomly happened and has never happened before......

I have 1 Tuner connected to a fixed dish on 28e and the 2nd Tuner connected to a motorised dish the preferred Tuner is set to Tuner B ( the fixed dish ) although I have tried changing them about without success...
My problem being that when I record a program on either Tuner the other one won't work ie. the screen goes dark...if I then cancel the recording Both Tuners work fine. I have alternated preffered Tuners and moved the Motorised Dish to different Sats. I can then zap between both Tuners and both work fine. If i then press record on either Tuner the other one stops working. This problem has just randomly happened everything was fine on Monday.!!!

Any Ideas please would be appreciated..

Rgds.Tryharder