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CM1100V download light blinking
Model CM1150v New as of two weeks ago Firmware Version V4.02.02 Server is Apple Airport Extreme Provider is Comcast After a reboot, all works normal for a while, then the downstream light star...
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