This model dates back 2016 if I am not wrong.
This issue is screen flickering so meaning the panel is faulty.
Not to worth to repair since you can get a new monitor instead.
most likely hum chee peng already but try to do a power cycle by powering off and then after a few mins power on again, change the display cable and hook it up to another PC/media box and see if goes away.
Also had this similar screen fading in and out issue on a samsung 22 inches monitor around year 2017. It happen about a year of usage. That free samsung monitor was discarded.
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