For those with the stuttering issue - is anyone running a stock unit with no external eSATA drive and no upgraded internal drive? I have the stuttering issue on some of my HR20s with external drives while some HR20s with external drives do not have any issues. However, 100% of the stock units work fine. If I remove the external drives from the stuttering units, everything works fine. I tried replacing the HD enclosure and even replaced the HD - same issues with the stuttering units. I wonder if there is some issue with the eSATA port causing the problem?