Currently, Sundance is unviewable on macOS (via Chrome browser), AppleTV 4K, and iPhone 11 Pro. Constant audio drops and video is very jerky. This started early this week; over the weekend and last week, everything was fine.
When tuning the Hallmark Channel and the Hallmark Movies/Mysteries Channel on the iOS Channels app, there's a message that starts off with: get: (some url) and the end scrolls off past the screen.
Provider is AT&T TV and using their app, there are no issues with any of the above channels.