There can be several reasons why a series recording didn't record an episode of a program:

• The series recording is set to record "first-run" episodes only, and the episode to be recorded was a re-run.
  
  
• You've run out of space on your DVR and you've set your DVR to not delete the oldest recordings to make room for new recordings.
  
  

Tip: Ideally, you should try to ensure that you have at least 10% free space on your DVR's hard drive when you record new programs. Remember that if you record a program in HD, more hard drive space is required to store that program than the same program if recorded in standard definition.

• The program information in the guide that was provided to Verizon was not unique, and therefore may not record properly. This can happen occassionally with a small number of programs.
  
  To avoid this in the future, set up a manual recording.