I have been having a similar problem w/cox in northern va.
see my posting at this link:
still not resolved, but have been working with tivo support by private message (see at top right side re messages after you sign in).
Here is the last responses I have received:
I have filed a lineup report to correct incorrect PGD, and for the issue tuning channels when the tuning adapter is attached, I have submitted a request to our Engineers to deploy a fix to the unit.
The lineup issue occurs when the Cable Provider does not properly inform Tribune Media Services (the company that makes TV Guide) of changes in advance. The issue with the Tuning Adapter is a channel mapping issue between the tuning adapter and the TiVo. There was an increase in tuning adapter channel mapping issues after the latest software release so there really is not anything you can do to prevent that type of bug from affecting you. You did everything you could I think.