Hi I own 3 Tivo Hd units with lifetime. 2 of them I have upgraded to 1tb drives. Recently I have had an issue with one of the units rebooting and freezing all the time so I thought I was having the power supply problem. I swapped power supplies with a good unit and no change. So I went and replaced the drive with the original and it rebooted much less but now randomly freezes up and has to be unplugged and restarted. What causes the freeze up is that only hard drive or could I have a bad motherboard. I just cant see the original drive being a problem as it was fine before I upgraded to the 1tb drive.