I am trying to debug a Tivo Series 3 HD that is suddenly missing channels. It started a few weeks ago after years of working fine. A Tivo reset will fix it for a day or two. In most cases, the channels will eventually come in. Sometimes it takes 20 seconds and sometimes up to 10 minutes -- we have tried all the tricks (changing channels, switching tuners). The Tivo signal strength meter shows 89 to 92 on most channels. We have Cablevision Optimum IO and the other 3 TVs in the house (one with a Tivo Series 3 HD) are not experiencing problems. I have searched around here and read all of Tivo's online troubleshooting. With a signal strength of 90, I don't think my cable company is the answer. I am planning on trying Tivo's call support line next but wondered if anyone else thinks it's the cable strength.