Hello and greetings. I have an HR21 about 6 weeks old. A couple of weeks ago it learned a rather disturbing trick. It will record a scheduled show, but when I try to play it back there are 60 minutes of black screen and silence. There is nothing at all there, but it seems to play for the right amount of time. It did this with both Mythbusters and Dirty Job both 2 weeks ago and last week. This week, however, both shows recorded fine. This week, The Biggest Looser was a big loss. 2 hours of nada. This week's episode of Chuck did something else rather strangely. Any time after 24 minutes into the episode, hitting either the skip ahead or back buttons jumped me back to the 24 minute mark. Any thoughts? Thanks.