A moving screen is usually indicative of a hardware issue. It could be related to the display itself, the connection between the display and the motherboard, or even a software glitch causing unexpected behavior.[br]
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You can do two things for it as restarting phone normally won't work for you.[br]
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Safe Mode: Restart your phone in safe mode to see if the issue persists. If it doesn't, a third-party app might be causing the problem.
Update Software: Ensure your phone's operating system and apps are up-to-date.