Repair Wifi on Arch
Suddently today my wifi stopped working, even after reboot. What helped was to turn down the wifi interface and reset netctl.
ip link // find out your interface sudo ip link set [interface] down netctl stop-all netctl start [profile]
If you deleted your network profile, run
wifi-menu to connect to your network and auto-connect to it with systemd:
sudo wifi-menu -o