Glad to see you here in the Roku Community, @mshetzline!
We understand you're encountering unintended behavior when streaming with your Xfinity app, which has an audio problem when trying to watch content.
Since this is the only app having a problem, we recommend reaching out directly to Xfinity Customer Support. As they manage, maintain, and regulate the channel, they can offer advanced troubleshooting steps tailored to your concern.
We are hoping that this gets sorted out soon for you.
Best,
The Roku Community Team
Emmanuel-D.
Roku Community Moderator