iPhone 5 graphics doubled, lines
My iPhone 5 graphics suddenly has a problem. The graphics are blurry, and has a "double vision" effect. Everything on the screen is repeated/copied vertically just above the "real" text. The double vision effect appears and then disappears at random.
There are also dim vertical lines on the screen which are only visible when displaying a black image.
At the very top there is a thin horizontal line which flickers, perhaps the screen has shifted downward and I'm seeing the bottom line of the screen displayed on the top.
The phone was not dropped or exposed to water. I have tried powering off/on the phone. The problem persists.
What could be the underlying cause?
iPhone 5
16 MB
iOS 8.3