Everything freezes, crashes, and black-screens.

If I have too many apps/game open (like even 2 or 3; sometimes even 1) my entire computer will freeze for ~3-7 seconds, then my screen will go black for a few seconds. Once the screen comes back, every game or application will have crashed, given an error, or becomes unresponsive. In the most extreme cases, I'll have to completely turn my monitor off then on or even my computer.

I've tried looking up what this could be but I'm not really good with stuff like this. The closest connection I've made is that whenever I do something like open a new tab in a browser or even just move my mouse too much, the GPU will spike from an average of 10% utilization to 100% and then the crashing and freezes happen. I don't know why this started happening all of the sudden. It says I have 2 "Display Adapters?" if that's correct and one of them is never used at all. I really don't know what would be important to include in here for specs or hardware because I've never done anything like this so I'm going to put as much stuff as I can figure out below to help.

Literally ANY suggestions are wanted. Thank You!

CPU?: AMD Ryzen 5 7600X 6-Core Processor (It says that name 12 times)

Memory?: 16GB DDR5

Display Adaptors?: AMD Radeon(TM) Graphics ; NVIDIA GeForce RTX 4070

Computer: ACPI x64 based PC ; Micro-Star International Co., Ltd. MS-7D78

Monitor: Dell P2422H (HDMI)

All of this is just from Device Manager. I don't know of there's a better way to check this stuff.

If there's any more info that you might need/want to make the best judgements lmk what a how to get it if it isn't in device manager.