How to get Comcast and Tivo to work together?

I have a Tivo Premiere. I have Comcast. How do I avoid throwing my TV out the window in frustration? About once a week I'll turn on HBO and see a message that that channel is not authorized. It is authorized, so I call Comcast, spend 10 minutes dealing with their customer service line, they send a signal to my Tivo's cable card, and within an hour HBO is working properly... for a while. Last week I called Comcast and got it temporarily fixed through the phone menus. I dialed the usual Comcast number, followed the prompts, and was given an option along the lines of "If you are seeing an error message that the channel is not authorized, press 3." I pressed it, Comcast did something, and HBO clicked on immediately. I didn't have to deal with their customer service and the results were instant. This happens with a few other channels, as well. Sometimes I sit down to watch several day's worth of shows and find that none of them have been recorded because of that issue. This is annoying. My questions: 1. Who's fault is this? Tivo's? Comcast's? Mine? 2. How can I stop this from happening? 3. If I can't stop it, how can I get back to that phone menu? The customer service people couldn't help when I asked.
Answer:

I have series 3 units with CableCARDs. Once every few months I have to reboot them to reinitialize the cards and one Tivo seems more susceptible to it than the other. Have you spoken with Tivo's CableCARD support hotline? http://support.tivo.com/app/answers/detail/a_id/141

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