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Your signal may have been weak when doing the recording.
Have you checked cable-connections? Unplugged and reset both the DVR and the cable-box?
Please see if this helps.
Thanks for contacting us regarding your experience with your recordings. If you are still experiencing issues after trying the steps provided by @MNtundraRET, please send me a private message with your first and last name so I can access your account and try to isolate the cause of your recording issues.
To send a private message click on my name "ComcastChe", then click send a message.