Two-story house. Roku streams Xfinity with no problems downstairs. But connection is spotty upstairs. I have tried two different Roku devices. The upstairs exhibits no problems with Netflix or Amazon. But transmission stops and starts and reloads when trying to watch recorded shows on Xfinity beta stream and sometimes with Xfinity stream live. Network check upstairs shows connection and downloads strong. I haven’t ditched my upstairs cable box yet so I probably will keep it if I can’t find a solution. Any ideas? Thanks!