Now You See It…Now You Don’t
Intermittent Internet dropouts plagued one home theater installer for months despite modem swaps, new coaxial runs, and shielded Cat 6 cables. A spectrum analyzer finally exposed the real culprit: a Comcast X1 set-top box blasting broadband RF interference every two seconds, coupling noise back through its own RF input and killing upstream modem signals. Swapping the offending Samsung-built unit for a compact replacement restored clean service instantly. The full diagnostic story holds lessons every cable subscriber should hear.