They had a recent upgrade to Roku tv apps. Some people Roku devices we're unlinked or needed to be replaced. On or around the 24 the November 2021.
So it's not Xfinity it's outdated gadget's from Roku. Although very few I was one of those people.
Better to use Roku Stick and I Suggest Best Buy For All Electronic Issues, and a better price.
Merry Christmas 🎄 and many more.