Do I have to reconnect all my devices to the network after I change the Wi-Fi password?Updated 2 months ago

Yes. Since Atmos devices and apps connect using the Wi-Fi network, devices that were previously connected using an old network username and password, will need to be re-connected with the new credentials. Simply ""remove"" each device from the app, then selectthe option to set them up again.  You can also use the ""Auto-discovery"" mode to add multiple devices at once.