You should never put a signal amplifier before your cable modem. To be set up correctly, you should have Cox come out, and run 1 line directly to the cable modem, then 1 line to the amplifier, and split your TV lines from the amplifier. If you cannot keep signal long enough on your cable modem with out the amplifier, you will need Cox to come out and look at that as well. I had a similar problem for a long time. Cox eventually did "maintenance" on the repeater across the street, which took care of my problem.
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