MsCJA72 We are primarily users here just like you trying to help other users, like you, where we can. Since you are replying to an original post that is 10 months old, replying 2 months after your post, and don't provide specifics on exactly the exact situation you are having, your devices models, etc..., we have to guess. If you are having wi-fi issues, it could be that your router needs to be setup differently, especially if you have certain types of Roku devices or older ones.
If it has the capability, try to set up a separate network that is 2.4 ghz only, using WPA2, such as a guest network, and see if you have better connection issues. I do not know how old your Rokus are, what OS they are running, what models they or many details at all, so us users here can only help so much with the information you provided. If you have older models, they may be having issues because they are older or running an older OS.