Yeah, I have had this issue a handful of times, and I can only assume it has to do with the drivers themselves. For a while I actually switched to the "Studio Driver" version, hoping to avoid this annoying issue altogether, which I did, and still played games just fine. Not once did I encounter this issue in the year, I used the studio driver. I did eventually revert back to "game ready driver" as I was troubleshooting something with steam link/moonlight, and it has been fine, until yesterday. I installed the latest December GRD update, and my screen goes to the usual black, which turns off the monitor, and I expected it to return to normal, and instead it was flickering black and grey and making an audio buzzing sound. As you can imagine this is absolutely irritating, and I instantly felt like the driver destroyed my PC. However, force rebooting brings everything back to normal, and the driver apparently did not even fail. Which, I am glad that's the case, but I don't get why this is such an issue from time to time? I absolutely feel its driver specific, because it doesn't happen with every update, but when it does, I can replicate the problem by reinstalling the driver. This has nothing to do with my PC/hardware. Nothing else causes any similar issues like this. I play games just fine; it is 100% always related to the GRD in the GeForce experience app.
Also, force reboot does fix the issue for me, but when I replicated the issue by reinstalling the driver, instead of force rebooting, I just turned off my monitor and then back on and that fixed it. So, try that next time, and see how it goes.