Strange "scanlines" appear on screen, followed by permanent fps cut to around 5-10 max

[Radial]

This was fully unexpected so unfortunately I was unable to obtain video footage, but heres what happened:
1. Scanlines appeared temporarily when looking at the shop. Later on, as you can see in the above screenshot, the scanlines occured fully no matter where I looked. Rather than being overlaid on the image, they appeared go from visible to invisible depending on where they are on screen. transparency related, maybe?
2. Soon after, FPS was practically nuked, going from a smooth 60 to hovering around 10 max. doesn't seem to be a hard cap as it does get worse depending what I'm looking at.
3. Scanlines disappear but the FPS drop remains, and does not stop until the match is left
I'll be recording gameplay and will update this post if this happens again.

Specs"
16GB Ram
I7-11800H Intel CPU
RTX 3050Ti GPU

 

[Radial]

Update: Have a video. No scanlines, but the FPS drop occurred and was fairly consistent.
View attachment yikes.mp4

 

[Tedeshi]

RTX 3050Ti GPU

Make sure you are using the latest drivers.
Which rendering api do you use? DirectX or Vulcan. Have you tried swapping them?

 

[Radial]

Make sure you are using the latest drivers.
Which rendering api do you use? DirectX or Vulcan. Have you tried swapping them?

I was running the latest drivers, and I'm running the game on Vulkan. I'm going to be doing more testing on both apis.