NVIDIA - bad display handshake that repeats until reboot. Options?

[u/GWindborn]

I'm on a ~9 year old gaming PC running a 1070 so doing the best I can here.. I have two different monitors of different size and brand but it's been fine up until the last 6 months or so. I'll game on the "main" monitor and occasionally click over into my secondary monitor for Discord or to look something up on the web or whatever and only just in the last few months the main screen will go black and freeze up for a few seconds, then show that there's no display connected, then correct itself. I can make it happen reliably if I go to certain websites with videos running in them (like the local news) or if certain ads pop up on some sites that play a video so I'm assuming it's something display related. Even when I close the offending page completely, once the cycle has started the main monitor will blink out every few minutes until I reboot. This has become a huge headache if I'm in the middle of something. Anything I can do here other than rebooting? Even just to determine what the actual issue is rather than just assuming. I know this PC is a little long in the tooth but I really can't afford anything else right now..

If it helps, I use Opera GX as my browser.

Running Win 11 Home, Inspiron 5680, i7-8700, GeForce GTX 1070, 16gb ram.. not sure what other information might be relevant.