This sounds like macroblocking, which is a fact of life on fast moving, live HD programming. Search for macroblocking on this forum - plenty of previous threads. A proper setup of the TV can help minimize macroblocking if you're still on the TV's default settings - reduce sharpness, turn off edge enhancements, change to better picture mode, etc. Read the link below:Anyone else notice blocky, pixelated HD picture if the scene is moving fast?
Noticed this during World Cup and Star Trek on TMN.