Verizon cablecard problem

I have had a Verizon FIOS cablecard for about 5 years. Used it first in my TIVO Premiere and currently in my Roamio Pro. Tonight it de-authorized itself. Never have had it happen before. I have Verizon FIOS STB in another room in my house and there was no issue at the same time my TIVO stopped working. I called Verizon and their automated system was able to fix it. Took about 1/2 an hour. The weird thing was I recording on four channels at the time and even though the screen was black on the channels it recorded two of the shows in their entirety. The other two were partial recordings and no signal was getting through. The message on the TIVO was something in regards to #161, whatever that is. Anyone have any idea what would have caused this. I have had the cable go out at my house several times over the last 5 years but nothing as bizarre as this.