At the end of a channel information update, my Tivo HD either freezes or reboots. I have replaced the hard drive after verifying it for no errors. I then re-imaged the hard drive and redid the guided setup. I also had the capacitors replaced on the power supply board. Even though the update 'fails' per the message, sometimes the channel information is updated after the 'updating channel information' screen blocks live TV for about 3 minutes. I also often get a reboot if I move within the Tivo screens while the update is underway. I get a reboot also if I am downloading a file from my PC using Pytivo and move through Tivo screens.

I also posted this to the repair Forum - didn't know which would be more appropriate.