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My old m7 also had the purple camera problem, something to do with the camera module being damaged by the heat thats caused by the Zoe feature over time.
Mine started off with snapchat, then got worse on the normal camera in low light. Send it off for repair, mine was returned within a week with a new camera module and now works perfectly.
They fully wipe the device for data protection so make sure it is backed up beforehand.
Never seen one with the lines on it, but the camera module is a weak point (on the M7 at least).