Roku or Xfinity app

I have the Xfinity app on my Roku and in the last 12 hours I cannot use the app.  Because when I enter the app on Roku it immediately closes after I open it.  Have tried to delete the app and reload it and it continues to do the same as previously mentioned.  My Internet connection is great (checked), no problems with other apps on Roku, though it seems I cannot get local programs on some of the other apps either with no error code.  Please help, give suggestions, very frustrated.