Games are glitching out heavily

Hello, I've had my PC for around 3 years now and have never had issues like this before while gaming. Basically whenever I boot Elden Ring or Sekiro I get these white/static-looking horizontal bands appearing and disappearing in a flash all across the screen, and also things shift from left to right a bit in a glitchy way, and lastly the screen goes black for several seconds at a time. My specs are:

intel i5 12600k

XFX Radeon RX 6800 XT Merc

16 gigs of Kingston Fury Ram

1tb NVMe SSD (can't remember the brand)

Corsair SF750 Power Supply

ASUS ROG STRIX B660-I GAMING WIFI 12th Gen Motherboard

Windows 10

I tried uninstalling Steam (which implies uninstalling ALL of my Steam library), and then reinstalling it (along with Sekiro). I also updated my AMD drivers (Adrenalin Software). I've restarted my PC several times.

Sekiro still has the issue. I haven't even tried reinstalling Elden Ring yet to see if it still has the issue but it most likely will. Also, I am able to play Minecraft just fine, and also GTA V, although I will say that the white/static-looking band did appear just one time in a several hour-long session of GTA V (for a split second) - other than that the game was entirely playable. It's only on Sekiro that it's constant and unbearable, and the screen goes black every 5 or 10 seconds for a few seconds at a time - unplayable.

Please let me know if you have any ideas as to what I could try next. Thanks