I am not sure when it has the issue, but my monitor on reboot can be set to 240hz. After a day of use and go to bed I wake up to it being 144hz. I have to restart it to make 240hz accessible again. Then it works. I think it might be a long term sleep issue. I am on a clean install of windows 11. This was doing it on windows 10. But it seems to be a more recent issue of nvidia drivers breaking. I started noticing issues like my monitor not waking from sleep after updating the nvidia drivers.
GPU 4080 Super
Monitor Samsung G7 32inch
Sometimes I have to manually unplug my monitor’s power to power cycle it. Not sure if it is the gpu or monitor, because it seems to fix on a system reboot. Or something else related to my system.