My Series 2 Tivo started slowing down...now it is extremely slow (but still functional). If I try to watch a show it is recording,the show is choppy. File transfers off the Tivo are taking longer and longer... Is it the hard drive? I assume it is because it is the original drive from when I bought the Series 2 back in 2006(?) (Maybe earlier). How can I confirm it is the hard drive? If it is the hard drive, can I just pull the old hard drive and place a new one in it? Are there limitations on the size of the new hard drive I can put in it? Will replacing the hard drive affect my lifetime service? If it is not the hard drive, then the box is shot, correct?