This buzzing/frequency glitching has been occurring in Chicagoland area for the better part of two months. It is specific to AMC & AMC DVR'd content.
However, if using XFINITY on-demand the disturbances are not apparent. It only occurs with the compression of the real-time broadcast. Unfortunately, it's at the point of ruining shows (The Walking Dead).
Nothing like seeing Jesus wandering through a fog lit graveyard, with minimal sound only to be interrupted by the digital farts of AMC.
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