Hello,
There is an update of artix-mirrorlist :
pacman -Qs artix-mirrorlist
local/artix-mirrorlist 20211020-1
Artix mirror list for use by pacman
sudo pacman -Sy artix-mirrorlist
Next :
sudo cp /etc/pacman.d/mirrorlist.pacnew /etc/pacman.d/mirrorlist
I have commented out all the servers except those that interest me in the new file /etc/pacman.d/mirrorlist
And after that :
sudo pacman -Syyu
And everything is back to normal.