ROKU Suddenly won't connect to Internet

I am not sure if the roku stick works like the Express but i was able to get my roku Express to connect back to the wifi again by doing a factory reset.

Press the 

Home x5

Fast forward x3

Rewind x2

Should take you to s screen where you can choose factory reset. Hopefully this works for you🤞

Additional resources that you might find helpful from the Roku Support site:

• How to connect your Roku device to the internet using Wi-Fi® or Ethernet
• How to check the connection to your home network and the internet
• How to improve the Wi-Fi® or wireless internet connection to your Roku® streaming device

Factory reset is a last resort because you'll have to start all over from scratch to set it up again, as though it had just come out of the box.

This has worked for me to fix wifi problems - try it before resorting to a factory reset.

• Restart your router (yeah, I know everything else connects okay, try it anyway).
• When router comes back up, restart your Roku, Settings > System > Restart system
  (or for a Roku TV, it's Settings > System > Power > Restart system).
• When Roku comes back up, Settings > Network > Set up connection.

Let us know how you make out.

[Edited to add...]

There are a couple of network connection problems being reported since my original post that have been caused by updates to routers. These have primarily been reported with routers supplied by internet providers (Comcast/Xfinity, Cox, and AT&T reported so far), but it's possible they could also occur with user-owned routers that have received updates.

• ROKU LOCATES NETWORK BUT CANNOT CONNECT
  Some router updates have changed the router's connection settings from b/g/n to just g/n, causing some Roku models to lose their ability to connect to the network. The solution is to set the router's configuration back to using b/g/n.
   
• ROKU CANNOT FIND LOCAL WIFI NETWORK
  Some routers have had their 2.4 GHz wifi band turned off, leaving only the 5 GHz band operational. Devices with single band wifi radios, notably Roku Express and Premiere models (but not Express 4K models) as well as many other single band devices can not even see the 5 GHz band. The solution is to reconfigure the router and turn the 2.4 GHz band back on.

If you need to make configuration changes on equipment supplied by your internet provider but you have no access to its settings, you may need to request your internet provider to make the changes for you.

I can only repeat what worked for me, which was changing the wi-fi channel. I'd been having intermittent Roku problems for ages, then changed the channel on another user's advice, and it's been fine ever since. (It's an easy fix to Google if you're a dunce like me!) Good luck!

• Restart your router (yeah, I know everything else connects okay, try it anyway).
• When router comes back up, restart your Roku, Settings > System > Restart system
• When Roku comes back up, Settings > Network > Set up connection

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WTF it worked for me!?!1! Didn't even had to re-setup the connection.

TV remembered previous SSID (Changed router recently so I forgot whether I had connected this TV to it) and Android Mirroring also worked, so a busted WiFi couldn't be the reason, I thought.

Everything else worked with the WiFi so I thought it wasn't either.