No good solution yet-- sorry you're having the same problem. I did turn on traffic monitoring on my wifi router (not a Cox one), so I will be able to tell in the future at least what machine is eating the bandwidth. But so far haven't seen anything out of the ordinary. I'll let you know if I figure it out.
Thank you for looking into this! Have you learned anything new?
We're experiencing the same abnormal "Network Management and Testing" spike with no change in devices or internet behavior.
Cox support was not helpful when we reached out.
