Upgraded several weeks ago. Now 160gb. The problem I am having is some recordings 'fail'. When I press the 'i' button, it tells me the reason is 'failed rec/unknown reason'. Most failings happen when I am not in/asleep. Sky+ is used 13-15 hours a day! The box is in a cabinet without too much space round it. I am thinking the system may shut itself off perhaps due to being too hot (I usually leave the box on but have read on other forums that this is not necessary). Does anyone have advice as to what may be going wrong?