So today I was working on Unreal and while working it got crashed and the whole screen went blank.
After few seconds when it came back, it had these random patches that come and go on different locations and time.
Did Unreal damage my GPU?
I tried upgrading the driver but still see these patches that come and go and sometimes the monitor goes full blank and comes back after few seconds
just delete/complete uninstall the drivers from you PC, let it run on windows default driver and install a version of driver from the time you bought this card. ( not the latest driver).
if nvidia card, you should be worried. if not right now, this is beginning of the end 
You should run a RAM check too. RAM issues also cause such screens.
Thanks to both. Trying to diagnose now. And yeah it’s a nvidia card. GTX 760
This is because of the driver crash.
Reinstall the latest version of the drivers.Also delete all the previous setup files in case you have used EXPRESS INSTALLER for drivers previously.
Monitor going blank for few seconds is common if you on hdmi. Recently i shifted from vga and dvi to hdmi and randomly m facing these blank screens.
Thankfully it doesnt occur while gaming but just when working on desktop. Refresh rate too is at default 60hz. Nvidia says its driver issue and day by day nvidia drivers are sucking.
Read this latest issue…
That’s most likely the gpu dying..
I had similar issues on my old HD 5570 and after trying almost every possible solution online the conclusion was the card was on its death bed..
Your case seems to be the same I’m afraid..
