Advertisements I just returned from a one week vacation and my TiVo HD said that there was an error with the cable card in Slot 2. The tuner associated with slot 2 does not function. For the heck of it, I removed the card and plugged it back in. It started working again. It has been fine for 2 days now. I know there was a thunderstorm while I was away. I have Cablevision of Long Island with NDS Cards. Any idea on what could cause this? Is it reason to be concerned?