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Forum Discussion
CM1200 - Uncorrectables on every channel - Internet dropping every hour
Hi Guys - Over the past 48 hours, our CM1200 has been losing internet access multiple times a day, sometimes once an hour. Restarting the CM1200 brings back access, but it's very bothersome and much worse than it's ever been before. We have Comcast and have not reached out to them yet.
I attached a PDF with the logs I pulled and event history. I don't know this area super well, but I know the number of correctables/uncorrectables is way way too high. I've read a bunch of similar posts and it sounds like calling the ISP to check the line is an important step.
Any ideas on the best first step? Thank you!
1 Reply
Any Criticals, Errors or Warnings seen in the event logs needs to be reviewed and resolved by the ISP. Indicates a signal issue on the ISP line up to the modem.
Be sure your using a good quality LAN cable between the modem and router. CAT6 is recommended.
What is the brand and model of the host wifi router connected to the modem?Power levels are kind of all other the place. Should be with in 3db on each channel. https://kb.netgear.com/24311/Power-level-guidelines-for-a-NETGEAR-cable-modem-router
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#M12853
https://www.duckware.com/tech/solving-intermittent-cable-modem-issues.html
https://highspeed.tips/docsis-events/
