I have heard a few complaints from CA recently but CA is huge though, so they might not be relevant. Is it southern CA? If so, see here, or is that you? So far now one has posted any data on the nature of the problem, like if it's signal related, congestion related, or something else like bad routing.
If you want to troubleshoot with the userbase here and not Cox, start with telling us something about your network and the problem. What model modem and router? If applicable, have you tried connecting direct to the modem? Does it effect both download and upload? What does a speed test show? Do you see packet loss or latency issues?