Starting at about 10pm CT April 28th, all Roku devices are blank. All apps are gray boxes and cannot be used! Logged in Monday April29th all still blank, if they can’t be fixed soon, I’ll be Looking to get a fire stick as this is terrible.
Roku has become to big and has forgotten it's goal of easy enhanced entertainment. Now, it has become a Chinese puzzle box full of techno frustration, confusion and time consuming methods that ignore the successful KISS (keep it simple stupid) credo.
The remote is a tiny cheap Cracker Jack toy, with no numbers.... as if their labyrinth system didn't demand such. Ha.
They have confused size with success, like the dinosaur, daily problems make continued existence problematic. The word is getting around.
It’s 3941RWS express 4k
Reboot your router again and try performing a Network Connection Reset on the Roku device. (Settings/System/Advanced System Settings/Network Connection Reset/Reset Connection).
If still no-go, try connecting to a mobile hotspot if available to you. (this will help diagnose if Roku's wifi module is working and is able to connect to an alternate network).
If using any type of mobile ISP app, make sure the internet connection has not been inadvertently "paused".
---
Provide some more details as to issue you are having. More detail the better. Are you able to see the network but unable to connect, or is the network not showing on list of available networks to join?
There are some router setting issues that can prevent establishing Roku WiFi connections. And to make matters worse, some of them can be set by recently-reported router updates. These have primarily been reported with routers supplied by internet providers (Comcast/Xfinity, Cox, and AT&T so far), but it's possible they could also occur with other internet providers or user-owned routers that have received similar updates.
Reconfiguring Router
Thanks to forum user @AvsGunnar for providing the links below to instructions for reconfiguring router settings for the listed internet suppliers. If you can't do this yourself, you may need to contact your internet provider to make these changes for you:
If your problem was not caused by any of the above, a restart of the router (even if other devices are still connecting) followed by a restart of the Roku may allow the connection to be reestablished. Depending on your Roku model you'll find the "System restart" option under either "Settings > System > Power" or if you have no "Power" option, under "Settings > System", or if more convenient you can just pull the Roku's power for a few seconds and let it restart.