My name is ***** ***** certified professional with over 10 years experience. I will be glad to assist you with this.
I am sorry to hear that you are having this issue.
Try these steps please.
Unplug the power to the router for 1 minute.
Then while the router is un plugged, disconnect the Roku power cord.
Then reconnect the router and Roku power.
Then wait about 5 minutes and try the connection again.
Reply below with the results please.