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CM500V voice works intermittently after initial startup in July 2020. Many resets and unplugs.
Model CM500V purchased from Amazon in July 2020. After initial startup worked for 2-3 weeks without interruption. Since that time the dial tone has been lost many times after power loss, internet bli...
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