This started more than two years ago. The Cox representative suggested we get a new modem to address the issue. April 2017 we got an ARRIS Surfboard SB6183. This didn't fix the issue and the Cox rep...
What can you do? Three houses on 1 line and 1 house is polluting the line. It's a public utility problem. They have to replace the 1 line with 3 separate lines.