I wrote a few days ago regarding a stuttering problem on my HR20's external 1tb hard drive with recordings made after a certain date. Yesterday I discovered that my DVR attempted to record a program on a channel that was part of a free promotion last week and was no longer available when the DVR tried to record it (on the same date that all my subsequent recordings were unable to play without serious stuttering,etc). When I tried to play that program (the movie Dr. Strangelove), I got the on screen message "searching for authorized content". I deleted this "failed recording" and to my surprise, my problem went away too. Is it possible that this caused the problem???? I don't know what else to think, but all is working (for now).