On Monday of this week our 2 year old 51" Magnavox Rear Projection TV started having this 3D look of the colors being off and there is a huge green concave arc coming up from the bottom of the picture. We had tried resetting the convergence settings, but nothing seems to work. And, over the last few days we found that the problem only happens intermittingly. Sometimes correcting itself when turned off then turned back on...Please help!