It's tough to say without knowing the specifics of your hardware, but there should be a means by which you can enable logging on either your router (at the very least) or possibly your modem. If you run some consistent tests using whichever diagnostic tools your equipment has and log the results, then download them off of your device (probably via http from their web interfaces, http://192.168.1.1 etc.) and email them to Cox, maybe they would take a look. When you say that you'd like to 'dump some data to send them' -- do you mean data you have already collected? If so, by which means? Testmy.Net?