I hook my Roku up to the Wi-Fi and it worked great for a couple of weeks. Then I turned it on and it would not hook up to Wi-Fi. Showed good signal strength but would not connect. Tryed every suggestion but would not connect. Returned unit for exchange. Hooked new unit up and it connected to Wi-Fi and worked great for a couple weeks and then same issue again. Returned unit again but upgraded to a higher quality unit hoping for better results. No luck. No issues with any other products hooked to Wi-Fi.
If you are experiencing the same issue with multiple devices, it would lead us to believe that the issue is not the devices, but mostly likely your wireless network.
Can you provide more information about the issue you were experiencing? What specific Roku model devices were you using? What kind of wireless network were you using and who is you internet service provider?
With more detailed information, we will be able to assist you further.