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Sorry I can't help you but I've had the same problem appear recently on my Toshiba 32" WLT66. Fortunately I have an extended warranty so I'm presuming I'm covered if it's only going to get worse. If nothing else you get a bump from me.
Just had the same with my sony, its been sent back.. But what was funny, is when the guys came to collect it they asked to see the fault, it took me 10 mins to convince them it was there!!! Customer is always right you ********! They did see it in the end and said sorry for saying they couldnt see anything.
Just contact the place where you got it from and get it sorted! It is strange and very annoying isnt it!
* Mod comment: rude word removed - careful please *