Hiya there!
I've recently been struggling more and more with this monitor issue as depicted in the picture. It happens whenever I turn the computer on, e.g. when the monitor has been inactive for a while. These lines only occur then, and slowly go away by themselves - unless i change the refresh rate of the monitor. To be frank, this has been an issue for probably over 2 years - but its never been "this bad" before.
Got no idea what has caused this, why it (seems) to be getting worse, or what this type of monitor issue is called.
This is a AOC 32" screen, dont have the exact model - but if it matters ill try to dig deep to find that.
Appreciate any tips or pointers to this.
Try dropping the refresh rate just a little. Worked for my 27" AOC VA panel.
144hz on mine is very prone to this. 120hz only acts up on a fresh power-on. When it's cold I just set it to dim instead of sleep.