When I first turn on the Panasonic TCP50X1 the picture is good. If it stays on longer than 10 minutes and I turn it off and then back on I have red and green vertical lines across the screen. If I leave it on without turning it off the vertical lines never show up. After the lines appear I can turn it off for several minutes and turn it back on and have no lines. If I turn it off and back on in a short period of time then I have the lines. Evidently it is a heat related problem, any ideas?