I too have noticed this buzzing sound since the week of Halloween on my recording of the Walking Dead. It also does it on the Talking Dead following that show. It happens on my DVR recordings as well as live TV. I'm using a MX011ANM X1 DVR. The replies that this must be related to the signal level seems very unlikely as this is being reported by various customers across the nation. This only happens on AMC and has been going on since Halloween on both live TV and recordings.
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