I have never had this problem, and since your monitor is new, I can only recommend that you check if there is a monitor driver issue (not the same as a video/graphics card driver). Maybe you installed a driver for your previous monitor that is causing problems. Or maybe your new monitor requires its driver (instead of plug-and-play). You should also make sure that the refresh rate is correctly set for that monitor.
You can also try another media player and/or different videos, but I'm just guessing really.

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