Record 6 DVR "reference 2.1.2.7 when calling Cox Support"

When i select one of the shows in my Recorded Shows list, the screen turns black.  After 5-10 seconds, i get an on-screen message "We experienced a problem playing back the recording. Please try again in a few minutes. Reference 2.1.2.7"    This used to happen to one out of every 25 recordings.  Now it is happening once every 10 recordings.  Rebooting the box does not help.  Trying again in a few minutes does not help. I have the Contour 1.  

Cox moderators: what is 2.1.2.7?