As your problem is intermittent, and of an erratic nature which can cause misleading symptoms / diagnosis, I would advise you to at all times when you see the lines on the LCD to also check if the same applies in the viewfinder, the reason I advise this is because your model can suffer from the lens cap problem and what you describe can be a well known symptom of it occurring. If however that never occurs then the reason is most likely what the other posting has suggested, but if by any chance it does then thats a faulty image sensor, and which unfortunately the special free repair offer by JVC on this expired at the end of 2007.

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