Hello, we have not heard of known issues taking place regarding any misconfigurations of third-party modems, and I'm sorry this information was relayed to you. I am including some additional information on ways to improve your overall level of service:
www.cox.com/.../understanding-speed-test-results.html
www.cox.com/.../fixing-slow-wifi.html
www.cox.com/.../extend-wifi-range.html
For further assistance, please include a link to this forum thread and email us at cox.help@cox.com. -Kevin M. Cox Support Forum Moderator