Xfinity XFi App not working

My app has been working all this time and all of a sudden it does not. I can not pause/unpause my internet which is very frustrating. I have deleted and reinstalled the app several times. It lets me put in my login info then looks like it’s going to work but then goes back to the sign in box again. I heard there was an update and I believe others have had this problem. How do I fix?