Xfinity Stream App Stuck Loading on Samsung Frame

I've been using the Xfinity Stream app on my Samsung TV for a couple years without problems.  The last couple days the Xfinity Stream app has been stuck in the "three dots" purple loading screen an the app never loads.  

I tried using the "reinstall" feature on the app thumbnail, but it still got stuck at the loading screen. 

I tried unplugging the TV for a few minutes.  Still didn't fix the app. 

The only thing that worked was uninstalling and deleting the app and re-installing it.  That worked *once* and the next day the app went back to being stuck at the loading screen again. 

Any ideas?