I've got quite an odd problem with my Panasonic TX-L22D28BW LED TV. At certain times bright colours - especially pinks, whites, yellows - seem to be artificially boosted, resulting in a harsh, bleached-out effect. This is especially noticeable with skin tones, bright skies and fluorescent clothing. I've tried fiddling around with the various brightness, contrast and colour controls, but this just alters all the colours equally. The effect seems to come and go over a period of time, but it always comes back eventually. It's been like this for months now, so I'm fairly sure it isn't a burning-in issue. It's such a shame as the picture is great when it doesn't have the 'enhanced' effect. I'm using the TV on the True Cinema setting with sharpness turned off. Any help would be much appreciated.