One of the buttons is continuously stuck in a loop. It's the down button on the monitor. So it just automatically keeps on changing the display modes.
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@riooo ujse this guide ASUS VG248 Disassembly to pen up your monitor. The disconnect the button bar. See if the menu still comes up or settings change. If not, then it is most likely a fault on that bar. If it still happens, it is on the main board.
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