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Netgear CM3000 v6.01.03 firmware causing T3/T4 timeouts - request v6.01.04 push

slackingaruda
slackingaruda Posts: 1 Newcomer
in Home Networking

I'm experiencing frequent service disconnections on my owned Netgear CM3000 modem since it was updated to firmware v6.01.03. My event log shows over 20 critical errors in the past 4 days, including:

  • Multiple T3 timeouts ("No Ranging Response received")
  • Multiple T4 timeouts ("Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received")
  • TCS Partial Service events
  • US Profile assignment changes (modem being downshifted between OFDMA profiles)
  • SYNC Timing Synchronization failures

These errors are happening at all hours of day and night, with disconnections occurring multiple times per day. The errors are characteristic of upstream signal/registration issues, but this pattern is documented across multiple CM3000 users on both Spectrum and Xfinity who received firmware v6.01.03.

This appears to be a known firmware regression. Netgear released v6.01.04 in November 2025 specifically to address the v6.01.03 issues. There's also precedent here: a similar v.03 firmware was previously pulled by Xfinity/Netgear in 2024 after the same pattern of complaints, with affected modems downgraded back to a working v5.x release.

Existing community threads documenting this issue:

  • Spectrum community: "Netgear CM3000 – Firmware v6.01.03 Causing Constant Disconnects"
  • Netgear community: "Now Spectrum has updated the CM3000 to version 6.01.03 - they refuse to roll it back"
  • Xfinity community: "CM3000 Slow Login with New Firmware (V6.01.03)"

Request:

Please either:

  • (a) Push firmware v6.01.04 to my modem, or
  • (b) Rollback my modem to v5.01.02 (the prior stable firmware), or
  • (c) Provide official acknowledgement of the v6.01.03 regression and a timeline for the fix

I can provide the full event log, modem MAC address, and account details via private message or ticket. I'd prefer not to swap to a rental gateway or replace my purchased equipment due to a firmware issue that has a known available fix.

Thanks for any help - I know firmware decisions sit with engineering, so any visibility this gets internally is appreciated

Comments

  • HT_Greenfield
    HT_Greenfield Posts: 1,327 Contributor

    Give it a factory reset (not just a reboot) and then, regardless of which version of firmware it ends up receiving from either the OEM or the ISP, if the faults persist, get a local tech house-call scheduled in case the root cause has to do with signal quality and/or provisioning.

    🔗 https://community.netgear.com/discussions/home-cable-modems-routers/spectrum-cm3000/2464374 : "[…] update. I don't know what changed because it's still showing firmware version V6.01.03 but as of today the CM3000 seems to have stabilized and appears to be working normally again on Spectrum. […]"

    🔗 https://www.reddit.com/r/NETGEAR/comments/1myf3g1/comment/nb177rl/ : "[…] a fix was pushed out late Monday or yesterday that took care of the issues on Spectrum at least. […] It's still showing firmware version V6.01.03 and it's now been working normally for over 30 hours with no issues and a totally clean empty event log."

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