TV keeps cutting out?

My 32LC46 keeps cutting out. To restore it I have to switch it off and on again. It happens more on non- BBC channels. It will sometimes do it constantly and at others it will last out without a problem for ages. It seems to happen at a change over time in programming or when the programme has a very heavy audience. My reception is through Virgin cable so don't know whether it is the TV or my V+ box but that does not show any cut out when it happens. I have checked all the cables and reloaded the channels but nothing seems to help. Any advice please.