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Upstream connectivity issues between the hours of 18:30 -24:00.
I have been suffering from failed data upload and severe gaming "lag" for the past two weeks during the hours specified. When I was tracking the issue I found that it has been replicable between the hours stated. With a speed test (OOKLA) being being used as a basic tool to evaluate my connection, I found that the upload speed is ~23Mbps from 08:00 to 18:30, then when the period mentioned in the question is reached the speed drops to ~0.4Mbps.
I have had techs out for the past 4 day, new co-ax has been installed and the line maintenance department has been out. None of these have solved my issue.
I was told that I needed a DOCSIS 3.1 compliant modem on my service, though my 3.0 compliant modem was certified by Spectrum for my plan. I have updated to a SB 8200 from a SB 6183 and still my issues persist.
Looking through my modem logs I have found that in the evening I get the error "No Ranging Response received - T3 timeout" fairly consistently. I believe that the issue is upstream from my home connection, but how to I convince the service team that my personally owned modem is not the cause of my woes.