I've owned my 37" LG LCD TV for a little over 2 years. Its worked fine until the last few days, when THIS started. it works fine for a few minutes, then the screen starts flashing on and off, accompanied by a popping noise. Sometimes it flashes on and off for 20 seconds or so, sometimes the video cuts out and you can still hear audio. Sometimes it shuts off quickly and turns back on after a minute or so. I've heard of a few similar cases out there online. Anyone have an idea what issue I'm looking at, and how serious a fix this would be??? Thanks!