I have a Toshiba 57H81 that is about 8 months old. The problem I'm having is that occasionally these horizontal lines will pop up for a second or so, then go away. They're normally a green or bluish color. I've seen it happen on several different inputs (Progressive DVD, Satellite, VCR, Antenna). It seems to happen randomly. If I watch TV for a couple of hours it will probably happen a couple of times. Some nights it might not happen at all, other nights it will happen several times. The lines do not cover the entire screen from top to bottom either, maybe a foot tall, usually closer to the upper portion of the screen, but not always. Another thing that happens (not sure if the two are related), is it will make a loud pop sound, and turn off. Then it comes back on and everything is fine. This issue does not happen all that often (5 times since I've owned it). A local TV repair shop has it in their shop now. Before taking it away they thought it might be dropping scan lines (they did not see it happen, they were just saying this based on my description of the problem), but since they've had it in their shop the past week, they cannot reproduce the problem. Does anyone have an idea of what the problem might be? It's still under Toshiba Warranty, but what do I do if the repair shop can't find the problem. Thanks for any help.