Are your troubles dependent on the time of day? Mine are very clearly congestion related as they correspond EXACTLY to what is considered to be internet "rush hour". My modem is a Motorola SB6121 which is DOCSIS 3.0, but it can only bond 4 x 4, which ironically is still capable of handling far faster speeds than Cox advertises for Ultimate, though the service requires a modem that can bond 8 channels. I'm now wondering if this has to do with all of the students returning for the semester. Approximately 50,000 heavy internet users suddenly are back has to put a strain on the system.
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