Try putting one one of the ferrite cores around the the tv input side of the component connectors. My guess is that this is interference coming from the TV and degrading the analog signal. Plasma's put off a lot of radiation and can cause issues like this. To prove this to yourself, try listening to an AM radio station anywhere near your plasma went it is turned on.
Ok so good news. I did still have the ferrite cores. More good news...I did notice some improvement. Once I installed the ferrite core, I also switched over to "cinema." During gamplay, I never even notice the interference. Occasionally, I will still see it flickering in/out on a dark screen (i.e. when a game is loading).
Another quick question for you, the largest ferrite core isn't big enough to fit around all the component cables. Is there a certain color it should go around? Right now, I have it wrapped around the video side of the component (blue, green, red).
Btw, sad to see so many here who seem disappointed with this TV. I love mine so far. Only complaint I've had is this minor issue and I can't seem to get BF4 to look right on my PS4. I've tried a number of calibration settings, but everything always appears really dark on it. Other than that, the games look incredible.