I have had this TV for a little more than 6 years. It is a 70" rear projection TV from Hitachi. I have noticed that about 6 months ago the picture seemed to start flickering every now and then. Recently, it has gotten worse. It seems like after the TV has been on for a half hour or so, the flickering goes away. Is there anything I can do to correct this problem. I would hate to get rid of this TV after only having it for a few years. Any help is appreciated. Thanks again.