Apple TV won't stay signed into Xfinity Stream

​I have to go back through the authorization process every day on one of my Apple TVs.  The good news is that the authorization works, but I literally have to do it the first time I turn on the TV on a given day.​

​My other Apple TV works fine.  As far as I know the only difference between the two devices is that the one that doesn't have to be authorized all the time is the 2021 4K model and the one that doesn't is the older 2017 4K model.  They are both running TVos 16.​

​Is there something that can be done to fix this?​