your issue looks similar to this one : viewtopic.php?p=246800#p246800 ; so his solution a few posts later may work for you too.
Mecir wrote:I solved the problem by decreasing the resolution and setting 75hz as refresh rate instead of the default 60. Aesthetic-wise not the best thing as it looks blurry now, but not a big deal either.
in that case it means it's something else.
1st thing is to check your PC doesn't trigger the energy economy mode.
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