Plasma Tv Flickers to a Black Screen?

We've just bought a new plasma TV and haven't had it long, when we watch channels, movies and play PS3 the screen turns back for about half a second then normal. This happens once every hour or several times in a minute. We've just bought it back in and got it replaced today with a new TV and it's still doing the same thing. What could be the problem?

Suggestion:

Try plugging one thing up to it if it works ok then plug something else up to it if your problems come back you might need to buy a splitter that lets you plug more then one thing into it that has buttons to push or a knob to turn to divide the signals

Tagged as: plasma flickers black