Mine has started doing this over the last few weeks. It's says the WiFi is not connected on a blue screen. Strange thing is, the puck is connected by ethernet and WiFi is turned off!
If I go in settings->Network, it shows it connected to ethernet and all statuses are ok (sometimes say it can't connect to the router).
Apple TV and Smart TV are connected to same ethernet switch and work fine.
It's been connected fine like this for over a year so it feels like a bug has been introduced in an update.
