I've had Xfinity for many years, using the Firestick. Recently I was getting a lot of buffering. I have an app on my phone called "WiFi Analyzer". I saw what channel my WiFi was using and it showed that a better channel would do better. I went into the Router settings and changed each of the two WiFi (2.4 and 5) settings to the suggestions and my TV experience is better. It's not "rocket surgery".
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