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I'm using an Arris SB8200. For the past week or so, the Internet cuts out for 10-15 seconds several times an hour. I've run a recurring ping and it shows it dropping on the first hop from my router. It's not a Wi-Fi issue--I'm on Ethernet--and it impacts multiple devices. I've power-cycled my cable modem, factory reset it, etc. but still have this issue.
Can you post your signal levels from 192.168.100.1? Also, do you see anything in the logs like T3/T4 time-out errors?
I can't login to my cable modem. I can factory reset it, but when I login with the default username and password it brings me to a "change password" page. When I change the password, it returns an error that says "Device failed to update password."My guess--and it's just a guess--is that Cox flashes the firmware via the coax when I first plugged it in, and did so in a way that prevents subsequent password changes. But without that, there's no way for me to login to the admin console.Edit: That's interesting. Having multiple numeric characters apparently doesn't work. I figured out a combination of characters and one numeric character that does. Let me look through the logs...
The forum software is flagging my response as "spam". I am seeing some errors:03/04/2023 12:03 82000200 3 "No Ranging Response received - T3 time-out;CM-MAC=[redacted];CMTS-MAC=b0:8b:d0:6d:d3:21;CM-QOS=1.1;CM-VER=3.1;"
Are they around the time of the disconnect? Also, what state are you in? Looks similar to this post.
Yes, I'm in Connecticut. I did verify those error messages appear when ping shows a disconnect. There is a single ODFM upstream channel.
USMA56795 said: There is a single ODFM upstream channel.
Ahh, so you do have the upgrade. Another state to add to the list. I bet the problem started when that OFDM upstream was added. Did you notice your upstream light on your modem turn blue around the time the disconnects started?
No, but I can watch for that. (It's two floors down from me.)Is there any resolution to it? Is Cox aware of these issues and fixing them as they go? Do I need to call them and reference some article or something?
I would schedule a technician. It might actually take a couple technicians to track down the problem. If it's related to the upstream OFDM channel, that is a very new problem so most Cox employees don't know about it yet. I suggest emailing Cox firstname.lastname@example.org with your account info and a link to this thread.