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Does it also happen while the device is connected to a charger? One of my old readers did funny things with its screen sometimes but it was just a battery going bad.
Are you using any mods? When I developed my ScreenSaver mod I occassionally got funny lines in the image and it took me a while to realize it was nickel in the background still drawing its wifi signal indicator - with the wrong rotation setting it turned into funny looking lines.
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