STB makes a popping noise when changing channels

For the last three weeks, I have dealt with the STB making a popping noise through my speakers when a channel is changed or I have used the fast forward/rewind feature of the DVR. This noise doesn’t occur anywhere else (different input options on the same input channel). I have also switched the living room box with the bedroom box. The bedroom box does not make the noise when hooked up to the same tv. Does anyone know if this is a setting or is my STB going bad and needs to be replaced?

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