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No Ranging Response received - T3 time-out : Firmware issue?
I began noticing erratic internet service issues beginning somewhere around Oct 8, or so. I'm continuing to experience symptoms like frequent, intermittent MS Teams "Your network is causing poor cal...
Has a factory reset and setup from scratch been performed since last FW update?
Have the ISP check the signal and line quality UP to the modem. Be sure the ISP provisions the modem correctly.
Be sure there are no coax cable line splitters in the between the modem and ISP service box.
Be sure your using good quality RG6 coax cable up to the modem.
Be sure to power OFF the modem for 1 minute them back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853
Try a different power adapter with same voltage and amps.