Read:
On again off again bug.
Test the LTS kernel, linux, linux-hardened, or linux-mainline kernels (and headers).
sudo pacman -S linux-lts linux-lts-headers
sudo pacman -S linux linux-headers
sudo pacman -S linux-mainline linux-mainline-headers
sudo pacman -S linux-hardened linux-hardened-headers
Reboot.
Swap kernels at grub advanced boot menu.