Do you know where the Comcast line comes into your building? If so, slip one of these https://www.amazon.com/Antronix-Filter-GLF-1002-Coaxial-Networking/dp/B01EXRMIIC/ref=pd_lpo_3?pd_rd_i=B01EXRMIIC&psc=1 in between the line from the street and the distributor/splitter that feeds the house.

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Alternately, if you're not using Comcast at all, just disconnect the street line entirely.

Interesting. Over here they use this because of the high failure rate of the PPC. Comcast has been coming around the neighborhood the past month changing them over. Mines in the basement so the tech had to come inside.