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There's another thread on this. I'm seeing the same problem - also on comcast (vinings front end in Atlanta). Comcast did a service visit today and measured the signal level:

-1 db @ tivo on ch 117
6 db @ tivo on ch 003
-11 db @ tivo on ch 186

According to comcast technician, comcast considers anything inside +15 and -15 db to be within specification, and they have a preference for a weaker signal on ch 186 since cable modems operate better in that range. He also checked that signal variation "flutter" was less than 1db.

The technician brought a replacement cable card, but that card appeared to be completely defective (i.e. wouldn't even make it to the cable card setup screen. And an error 116 kept poping up).
 
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