Woke up at 2:30 this morning to find the Deco system has disconnected all wifi and wired devices.  It refused to let my wifi devices connect to the primary or guest networks even though both SSIDs were visible.  My PC which is connected via Ethernet was not connected to the router and had a 169. IP address.  The only way I could resolve the problem was to unplug and plug the router connecte to the Internet.  After several minutes, the mesh system was restored and everything is now working.  I upgraded to the latest firmware, rebooting the routers about 2 weeks ago.  Since then, I have gone thru all 2.4 fixed location devices, reserved their IP addresses, turned off mesh, and selected preferred connections.  I find the cameras open faster when I do this.  Other than those changes, nothing else has changed.  Has anyone else experienced a lockup like this where the Decos still advertise the SSIDs, but all wifi and wired connections have been dropped?