Question First monitors flickers when I turn on/off 2nd monitor?

[themiziko]

So, I didn't have this issue previously, but now when I want to temporarily turn off my 2nd monitor it turns on and off my first monitor?
To be specific, nothing happens when I turn off my 2nd monitor, but when I turn it back on, both of my monitors turn on and off
My main monitos is 144hz and the second is 60/70hz. I tried to set them both to 60hz but it didn't fix the issue. It happened suddenly and didn't have this issue previously

 

[Ralston18]

Update your post to include full system hardware specs and OS.

GPU and PSU are of interest.

Make and model monitors?

Have you tried reinstalling the GPU drivers? Go to the manufacturer's website to download the current drivers. Reinstall and reconfigure for your system.