I'd be delighted to look closely to see how we may assist you. Do you receive an error message when attempting to connect to your wireless network or when streaming the YouTube channel?
For troubleshooting purposes, have you tried re-connecting your Roku to a solid wireless network to see if that helps resolve the issue you are seeing? You may also try to connect to an alternate wireless network, such as another mobile phone signal typically provided and maintained by specific mobile phone (cellular) service providers, to see if you are experiencing the same issue.
With detailed information, we will be better able to assist you.