I'm not sure if this is a Comcast issue or a Tivo issue. Every Thursday at about 7pm, we get "Channel Not Authorized" on every channel. A reboot takes care of the issue, and if rebooting were a 1-2 minute process it wouldn't be such an issue. But it takes half a lifetime to reboot and it's become more than a little annoying. Anyone else experience anything like this? Any suggestions?