I’ve had this issue before and solved it by taking the monitor apart and cleaning the buttons with alcohol. Take the button board and squeeze alcohol on them while pressing the buttons over and over to help wash them out. Then leave it for 24hrs to be 100% all the alcohol evaporated. The inner button getting dirty can cause a tiny short making it turn on and off or even eventually get stuck off. Be liberal and push the buttons a lot, especially the power button. You’re trying to wash stuff out of the enclosed switch. [br]
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Mine was turning on and off for awhile before getting stuck off. I figured at that point I couldn’t make it worse so gave it a shot and saved me from having to buy a new monitor.