Tivo Roamio sporadic "Channel not Available" message with Cox tuning adapter.

I am getting pretty fed up with this error.  I have already returned my first tuning adapter and cable card and Cox provided me with another what clearly looked like an old refurbished unit wrapped in plastic and dinged up.  In addition Cox routes me to a separate department for cable card issues that has more limited service hours.

It was working fine for about a month and again it started intermittently happening causing me to lose recordings.