Line of Pixels Intermittently Failing

Dear Forum,
i have a line of Pixels on my iPad screen that fails intermittently. Its not all the time, just every now and again.Odd as it sounds.
Is this the type of thing a genius bar can run a test on? i cant seem to 'force it' to happen so didnt want to make the effort and go to a Genius if it doesnt happen

Make an appointment at your local apple store and have them check it out.
If you can, prior to that appointment, since you can't easily replicate it, see if you can video tape it messing up. Just so that you have proof
Or when it's doing it, take a screen cap (hold down the sleep and home keys together and release them, like you would the shutter of a camera. ou'll see a white flash and hear a camera sound, the cap will be in your photos app)
Just so that you can take proof in of what it's doing

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