Some more info on this problem.
I forgot to mention that I am also having issues with Pandora when after about 30 minutes of playing Pandora starts playing one song after another for about 3 seconds and does not respond to any remote commands. Only solution is to shutdown X1 box.
Anyway I got a higher lever tech support person (again in the Philippenes) sho said that both Netflix and Pandora issues were known and it's due to a nationwide network issue that's being worked on. The initial date is Feb 26, 2019 and the Xfinity Incident Number is SI033124427. She described it as an issue affecting TV channels, Netflix, and other apps including Pandora. I'm a little suspicious that this is the same issue since I don't think the Netflix issue would cause changing TV channels to go to black screen as she described the issue.
I'm going to keep trying to escalate this issue until it gets resolved.
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