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This was happening to me when I was using a USB-C -> HDMI cable, and stopped when I moved to using a powered USB hub. This is the one that I've got (https://www.anker.com/uk/products/a8380?variant=37340052258980&discount=WS7DGEM2PI) but I'm guessing any powered hub would do.
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Sounds like Windows doing this. Check in the Power and Sleep settings, you can change the time it takes to turn off the screen.
mmccarthy
Jonny69
@moocher
My monitor goes to sleep after a few seconds when plugged into a Mac laptop but not a Windows one. Tried everything obvious including changing the hdmi cable. Anything else to try before buying a new monitor?