I was recording the British Touring Car Championship from Rockingham yesterday. It's a seven hour program and I only wanted to watch certain races. Towards the end of the program it switched from recording freeview channel 24 (ITV4) to channel 81 (BBC parliament). I had nothing other set to record. I noticed noise bars on the playback in the few minutes before it switched. Recording seems perfect up to this point. Today I'm getting signal strength 71%, quality 40 - 50% on channel 24. I've 93% free space available I've had problems recording long programs before, when trying to watch them in 'time slip'. The PVR won't let me watch close to the point that's being recorded, say within thirty minutes or so. Are these problems known, or could I have a bit of a duff machine?