Weirdest Monitor Issue

So I’ve recently been have this issue with what I’m thinking is ‘image retention’ rather than burn in. It’s been happening super frequently recently and I’m wondering if there’s a fix.

I’ve had this monitor 3-4 years now and it did it once when I first got, but never since. So basically, at specific times when something is on my screen, my monitor immediately starts these weird lines completely covering the entire screen (1st pic).

If I stay on the screen/app whilst this is happening it will rapidly start to retain the image deeper and deeper if I don’t change anything (2nd and 3rd pic).

But what’s strange is it seems random? I could open discord one time and the friends tab will start the lines, but as soon as I see them if I close the app or even click somewhere else within it, they go immediately. Same with if I’m scrolling a site. I’ll be scrolling and a certain section will start the lines. Scroll past it and they go, scroll back to where I was and they will start again. It even happens in-game if I’m looking in a certain area or in a certain menu.

However the same screen that has started the lines won’t always do it.

After a while (about 2-3 minutes) the lines and any images retained fade back to normal.

But what is this and why!?