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mykchicken's avatar
mykchicken
Guide
Apr 17, 2024
Solved

CM3000 painfully slow speeds via Comcast

Hello folks - anyone else using a CM3000 and experiencing painfully slow speeds?  I've ran through the typical troubleshooting (reboot, factory reset), confirmed the Modem is all green for Up/downst...
  • mykchicken's avatar
    mykchicken
    Apr 18, 2024

    Wanted to follow up on this - 

     

    I stopped by xfinity store and picked up an XB8 from them.

    Plugged it in at home & within minutes I'm seeing the advertised speeds... pretty much nail in the coffin - it's the Modem that's the problem.

     

    Going the RMA route to return it. 

     

    Truly appreciate the ideas & support of all you fine folks.

    Cheers

plemans's avatar
plemans
Guru - Experienced User
Apr 17, 2024

Got a screensnip of the cable connections page and event logs? 

One thing to try is have Comcast re-provision it. 

If that doesn't help, I'd try exchanging it. there's a pretty low failure rate but it could still be bad. 

And comcast isn't great at rechecking lines without charging you unless you've tried something drastic (like replace the modem)

mykchicken's avatar
mykchicken
Guide
Apr 17, 2024

I've had their techs remove it from my account and reprovision it 3 times over the last week with no improvements, but good call out. 

 

Attaching the cable connection screen. It's a long page 😄

The only thing that jumps out is that some of the power values are a bit high...but that shouldn't cause this kind of issue, and the modem internal time is 1 hour behind but...there's no way that's an issue..right? 

 

Good call on the exchange...at this point it's been several hours spent and it's definitely a $ net loss overall.