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Netgear AC1900 C7000v2 Downstream Light Flashing
I have had the same provider (Xfinity) and the same modem router for about 14 months. I had never had this problem before, but starting last week somewhere around 5 times a day the downstream ligh...
Power levels are too high. https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
Get you a -6dbm coax cable line attenuator between the modem and coax line.
Got some correctables and un-correctables however not horrible. Should be mostly zeros.
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.
Start with removing any amplifiers, signal attenuators, or splitters from the coax.
From there check the line for kinks, damage, moisture in the line.
Check the connectors for improperly made ends, foil touching the copper coax line, loose connections, bad/old/cheap connectors, or corroded connections. Replace them if you do.
Be sure to power OFF the modem for 1 minute then back ON.
https://community.netgear.com/t5/Cable-Modems-Routers/General-info-and-Troubleshooting-for-Cable-Modems/m-p/1530376#M12853https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/
Typical aerial cable coax lines often develop "issues" over time that lead to intermittent connections. There have been a number of posts on the Forum describing how the cable tech replaced the entire cable feed.
My experience is that cable techs carry power level meters and an assortment of attenuators. My Spectrum tech remarked, "oh. level too high" and installed one. (free)