Not sure if you have the same problem or not, but I had intermittent jitter spikes (and/or complete package drops) every 60 seconds on my Realtek chipset, ran:

sudo iw dev wlan0 set power_save off

And it’s been stable since (just had to make a udev rule to make it persistent across boot)

amdvlk, any reason you’re not using the Mesa driver, RADV?

What is your:

1. Kernel
2. Linux-firmware
3. Mesa

Versions?

Additionally, what does the kernel logs tell you when you get a green screen?

Have you enabled Southern Islands support as a kernel parameter? Your generation of GPU was originally supported on radeon, so you need to explicitly enable SI (Southern Islands) support to use amdgpu.

See ArchWiki for more information