Hi @Fungirl,
Welcome to the Roku Community!
We recommend starting here to troubleshoot Network issues: How to connect your Roku® streaming device to the internet using Wi-Fi® or Ethernet | Official Roku ...
We recommend rebooting both your wireless router and your Roku device.
Please keep us posted and we'll continue assisting you from there.
Best regards,
Mary
What is your router model number and who is your ISP (internet service provider)?
It is usually a wireless channel settings issue with the 5ghz band (using DFS channels 52-140) which are not compatible with Roku. If this is the issue, then need to Disable DFS usage at router or manually use non-DFS channels (36-48, or 149-161) in the 5ghz Wireless settings in router.
However, you should be able to connect to the 2.4ghz band if your ISP has not disabled your 2.4ghz ability.
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Provide some more details what is occuring and hopefully can get you back up and running.