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Hi. My new plasma TV seems fine when i first switch it on, then picture gets distorted after a while almost like way too high gamma or saturation setting. times vary but seem worse when the sound on my stereo is high eg. when watching a movie or playing music. I'm running my computer via s-video to the LG receiver and then out via RC to the TV. when i play video on the TV it also isn't perfectly clear an there is a kind of wavy distortion, but isn't too bad untill the picture starts going progressively more boltchy with the sound. if i switch it off for a couple of seconds it's ok for a while, then starts again. It's under warranty so i can take it back to the shop. could it be heat related?

Any advice on what I can do apart from taking it back? Thanks