Panasonic TH-42PX70B

[monkeez]

Hi, i have a Panasonic TH-42PX70B.
It has developed an intermittent fault. The screen will flicker and then go black, but the sound stays on. I have to switch the TV off for a while and then back on to get the picture back. It could be hours/days or even weeks before it happens again.
Any ideas?

Thanks