Event 2, AMD_ANR_BG_PROC

Uninstall and reinstall the AMD gpu driver and then in Powershell [admin ] run ---dism /online /cleanup-image /restorehealth ---followed bt ---sfc /scannow ---to clean up any corrupt files..

I've already ran ddu. That was a whole other nightmare. Didn't change anything. It made things even worse. Event viewer is pure AMD_ANR_BG_PROC errors now. I even tried going back a couple driver versions.
My bios won't update, it is supposed to restart but it just shuts down. Turns back on like nothing happened.
Updating Chipset driver did nothing.
I'll try the DISM cleanup

It would be helpful if you could list,in chronological order,the steps and methods used which led to the problem.
To describe the outcome of using Display Driver Uninstaller as a "nightmare " is puzzling.
What is the reason for attempting to update the bios and the method which was used ?
Perhaps the better approach would be to firstly restore the bios to the Default setting before uninstalling / reinstalling the AMD gpu card.

It's probably an issue with AMD drivers. I googled more into it and it seems to be an issue with the Noise Suppression option. I never enabled it so it confuses me as to why it's even throwing errors in its disabled state.

The whole thing started when my games kept randomly switching from Fullscreen to Windowed. I tried gaming in Fullscreen windowed and it caused black screen every 10 seconds IF my character was moving. If I let my character sit still I had no issues.
Before I realized it was a faulty cable I assumed it was a Chipset, Bios, or GPU issue.
I updated the Chipset
Updated the GPU.
Tried to boot into safe mode to use DDU. I had no display.
I ran DDU in normal windows.
Computer restarted and had no display.
Powered off.
Relocated the GPU to the 2nd PCIE slot and now I had a display with no AMD drivers.
Powered off and put the GPU back into the top PCIE slot.
Reinstalled GPU drivers from 2 months ago.
Attempted to update the BIOS from Gigabyte App Center as I always had before. Never had an issue. The app would be in a (Not Responding) state while downloading from the server.
Ran the process and it rebooted the pc, well it actually shut it off and never brought it back.
I assumed it did this because I had XMP enabled. Went into the bios and disabled it.
Ran the BIOS update again and again it shut down instead of rebooting.
Gave up on that.
Did some more googling and found out it was a faulty cable causing my games to black screen and go windowed.

I've cleared the Logs and haven't seen the error for an hour but I suspect it only occurs when I'm playing a game.
The error here seems to come in 4 different versions.... every 20 seconds.

AMD_ANR_BG_PROC
Function: ret=0 size=5 called.

AMD_ANR_BG_PROC
Function: GET_OUTPUT_DEVICES called.

AMD_ANR_BG_PROC
Function: ret=0 size=1 called.

AMD_ANR_BG_PROC
Function: GET_INPUT_DEVICES called.

Thanks for the information and which cable is the culprit ?
Does Reliability History have any entries covering the blank screen events and what happens when you reduce the Frames per Second for the games.Normal operation when the character is stationary seems to suggest FPS could be a factor
If you type in the Search box ---dxdiag ---do any pages ,in particular the Display and expanded Input pages have any reports ?

Well I had just upgraded from an LG nanocell that could do 3840x2160@60hz to a TCL 6-Series that does 3840x2160@144hz.

I had forgotten that the DisplayPort to HDMI cable was only rated for a maximum of 120hz at that resolution. It worked great for an entire day which was what threw me for a loop the next. Luckily I had a NEW cable bought as a spare last month that can handle 144hz @ 2160p. So far it's doing good.

Now I figured out the cable was wrong when I lowered the refresh rate in GTAV from 144 to 120. No more black screens.

As for FPS, it wasn't at least I don't think. I'm 80% sure it had something to do with triggering the refresh rate.