Apple TV+ app on my LG smart TV is not recognizing my subscription

The Apple TV+ app doesn't always recognize my subscription. Some days it works--and remembers the shows I've been viewing--and other days it behaves as if I don't have a subscription at all. Closing and reopening the app doesn't solve this; turning off then turning on the TV doesn't solve this. Logging out then back in with my Apple ID doesn't work either. The only thing that has worked so far is totally giving up and trying again a couple of days later. This is a free subscription. If this is "just how it is" I don't see the sense in continuing with a paid subscription going forward. None of my other streaming apps do this.