Just discovered this thread after a Google search for Netflix Stutter. I'm in New Jersey and have been having the same problem for several weeks. Had techs out to the house 3 separate times, to no avail. Moreover, none had heard of the problem. Apparently, they don't check this forum or Comcast employees on this forum don't pass along the information where it could be disseminated properly. The first tech swapped out my DVR box (the only one with the stutter), which left me worse off than before. My DVR was 85% full or programming and, despite assurances it could all be retrieved from the cloud, only 5% came back. I can't use a box without optical audio output due to my Sonos soundbar setup. Took me three home visits to get a supervisor out as I requested, but he was of no help, either. I've done all the usual troubleshooting steps, and the techs even replaced every cable and connection. Very frustrating.
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