I am looking to dianose an ongoing and slowly progressive problem, I having with my Sony WEGA HDTV model KD-34BR970. When it is initially turned on, has 3 to 4 inch tall horizontal band across center of screen with distorted blurry lines. The problem resolves itself after a few minutes as the band narrows down to one line across the screen and disappears altogether and is picture perfect until the next time tv is turned off and then restarted. The problem has been...