Welcome to the forums, newcomer!
When the panel is connected to another system/display source, do you see the same issue? Does the issue persist when using another, known, working cable? Do you see the same behavior when in BIOS?
I have never noticed this issue occur in the bios but I haven't replicated the time period where it would normally happen and entered the bios.
I will give this a try as well as connecting the monitor to another system.
Another thing that may not be clear in the video are these semi-transparent 'scan lines' going horizontally across the screen that have been consistently present for a long time now. I'm unsure if these lines are a part of the same problem or another but the lines and glitching appeared at around the same time though not during the same week.
Try the monitor on a diffrent computer / game console or whatever else you have around to rule out the monitor first. That being said everything you have shown and explained looks like a failing video card, not a monitor.
So I tried connecting it to my ps5 this morning with the same issue. Even while the monitor was on but unplugged from any inputs the glitching continued. I have a feeling it's hardware related to the monitor because my gpu is an RTX 2080 that hasn't had any problems in games or otherwise in functionality/temps/underload.
Here's the video showing it connected to the ps5