After doing a channel line up update my Hd tivo is going into constant reboots. It works fine when the cable card is removed for off the air channels and can play recorded shows. After putting the card back in It boots then runs for about 2 minutes. then reboots. I picked up a couple of new cable cards and they cause the tivo to do the same thing. I have talked to tech support several times and they don't really know what is going on other than the card reader failed. This is a life time unit that my other msd's are tied to. They really have no offers for replacing it other than a basic premier with a new lifetime for about $350.