Xfinity Stream app not working on Roku

My Stream app suddenly stopped working on my Roku, plugged in to a Vizio TV. I was watching football, and half way through a game it stopped working and hasn't started working again. 

- No error message. It starts to load, and then says "Attempting to Resume... We've run in to a problem while streaming. Please wait while we try again."

- I've unplugged the TV and the Roku

- I logged out of Xfinity app, and removed app. Reinstalled and signed in, which did not fix it. 

- I re set up my internet connection on the TV. 

- There are no pending app updates or TV updates. 

- Other apps on the Roku are all working fine

- The Stream app is working fine on my phone and laptop