Tvapp-00148 error

Suddenly today I can’t watch live TV through the xfinity stream app on my newish samsung. Keep getting the tvapp-00148 error. The online chat agent was no help. I was shocked to see this issue arose again recently, and posted about, but that xfinity still hasn’t solved it. Of course I tried all the suggested fixes, to no avail. Why is the xfinity streaming service consistently so terrible?