I've had a Sharp Aquos LC-52D92U for about 4 months now, and it has been terrific. All of a sudden today though, the picture got wavy side to side. I don't think it's the inputs because I've turned them off and on and jiggled the wires, plus it happens on all the different inputs, even ones with nothing connected. Anyone else heard of this happening? Anything I can do to try and fix it, or am I looking at a service issue?