I have the same problem going on, and I had two different techs tell me there is nothing wrong. It has been about six months going on
and I think I finally solved the problem, or a least got it to the point where it is alot better. I kept hearing it was the source, not the TV. They said it was like puitting cheap gas in a high performance car. Any who try this, I bought a choclate HDMI cord, not sure if that really makes a whole lot of difference,but after spending time with the Geeks @ best buy, they told me to contact Direct TV. I don't know if thats who you are using but wanting them to come out, the service rep told me to go into the menu, take 720p off and make sure the native on the video is turned off. Just make sure the source Stays in 1080 resolution! Try that, good luck and God Bless!