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Seems like a hardware problem. Something is probably overheating or something like that.
I would suggest either returning/exchanging the TV (2 wks is usually in most return policies) or if you can't do that, register your TV with panasonic. After registering, call them up for service covered by your 1 yr warranty.
sound like a heating problem and best and easy way to fix that would be to blow out the dust in it, but if it a Power board problem you should have it sent to a tv repair shop. check the dust problem first.
Probably some component in the power supply. Look for a leaking or swollen capacitor. They can change value during operation unlike a diode or transistor that either works or does not work. U might even remove and test all caps in the PS area and replace any one that is questionable regarding its specs.
I stupid friend of mine came over to feed my dogs when I was out. He watched my Plasme tv for a while and when he shut the system down he only turned the cable box off for opprox. 6 hours. I did have th Tv on pixal shift . Know my screen seams grainy in dark scenes . I does seem a little better after a rolling picture screen. How long do need to run the screen before it gets better?