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Solved
Nighthawk AC 1900 WiFi Cable Modem Router
Cox has flagged my modem: Service Interrupted; can't identify problem; my unit firmware matches Cox. Problem: connection fails or lags periodically for several minutes at a time; Cox reports no trou...
Problem resolved; the problem was "Cox ISP" or the line connection somewhere. Questioned: No details or explanation given for periodic outage and continual scanning for downstream and upstream channels or the continuous error log reporting from my Netgear Nighthawk. All i know is, it wasn't my Modem/router as continually pointed out and suspected from Cox ISP support end. Two technicians were out again yesterday morning and when i got out of the shower, the problem was resolved. Cox won't admit there lack of support online or over the phone, but needless online chat and phone support calls were never acknowledged. Thank you Cox ISP support for the last three weeks of disturbances on my line. :(
They want you to rent a modem /router from them since the lack of support by isp's for modems made by other then the one they want you to use is common. Arris seems to the most common make used by cable companies in parts of Florida and possible other locations.
All channels, 16 downstream and 4 upstream are functional with good signal strength. Downstream is flagged "Limited" on both my Netgear unit and Cox online. I believe it's because of the ISP's config and firmware and not my modem. If it ends up being my modem, which i doubt very much, i will replace it with a newer dual band and not rent one. The attached list of accepted Cox Cable modems is huge!
https://www.cox.com/residential/support/cox-certified-cable-modems.html
It could be the firmware on the modem but is the problem even if Netgear has new firmware for the modem the isp has to install it and some do not support every Netgear modem now and since it is not theirs they will not update it sometimes the same reason that you have to a cable box for a tv to receive tv channels you must pay a rental fee to use theirs.