Xfinity Stream on Apple TV intermittently gives TVAPP-00244 until force-quit

I am seeing a recurring problem with the Xfinity Stream app on all 4 of my Apple TV 4K, model A1842 devices in my home on differnt Sony TVs. The app opens normally, but when I select a live channel it will sometimes return error TVAPP-00244 and no channels will play. I am below the five simultaneous in-home stream limit. The Apple TVs remain connected to the Internet and other Apple TV apps work normally.

The important reproducible finding is that force-quitting only the Xfinity Stream app and immediately reopening it restores live TV every time. I do not need to restart the Apple TV, television, Xfinity Gateway, or network. This appears to be an Xfinity Stream app/session-resume issue on tvOS rather than a television, HDMI, network, or simultaneous-stream-limit problem.

Could an Xfinity employee please escalate this to the Xfinity Stream Apple TV/tvOS engineering team and determine whether TVAPP-00244 after app suspension/resume is a known defect? The reliable recovery by force-quitting the Stream app may help reproduce the issue.