Setup a series link for "How the Universe Works" on Discovery HD. When I checked my planned recordings at 6PM, the 9PM showing of How the Universe Works was scheduled as expected. Happened to check the schedule at 8:55PM and discovered that although the next two weeks of planned recordings were still there, the 9PM showing of How the Universe Works had disappeared. Checked the hiccups and the reason for not recording was that there was either not enough room for the recording or it predicted there would not be enough room when the recording was due? Very odd considering I only have 3 recordings to watch, the disk is only 2% full and all my planned recordings for the next two weeks are still scheduled! I left the box alone till 8:59 PM when it should have started recording (I have 2 minutes pre-padding so I gave it an extra minute) and it had not sorted itself out so I had to start the recording manually. Anyone any ideas what happened?