Cablecard help needed

I have 2 cablecards on my Xfinity account, both happily used in TiVos for years. One of them stopped working last night with, “This channel is not authorized…(V58)” messages on every channel.  The cable card pairing screen is now blank w/only a “Information is not available.” message. Help!  How can I get this cablecard working again.  The TiVos are the only reason I haven’t switched to fiber and a TV streaming service (I.e stayed w/Xfinity)…