AC1200 C6230 Modem/Router Drops Internet Several TImes per Day, Have to Restart
I have now used 2 of the same modem. I returned and replaced the first one I bought to rule that out as the issue. Both modems have had the same problem. The internet works great most of the time, but at least 2-3 times per day the internet starts randomly dropping out anywhere from 20 seconds to a minute, and I eventually have to unplug and restart the modem to get it steady again. I'm getting T3 and T4 timeouts in the administration event log.
I don't want to have the Internet company come out unless I'm certain the issue is on their end, as they will charge me $100 for a tech visit if the problem is NOT on their end. Any help would be greatly appreciated.
Re: AC1200 C6230 Modem/Router Drops Internet Several TImes per Day, Have to Restart
do you have a screen snip of the event log and the cable connections page? That lets us check the signal.
Things you can do to help prevent the cable company from charging you.
1. move the modem to right where the signal/coax enters the home.
2. remove any splitters, amplifiers, or signal attenuators from the line.
3. check the line for kinks, damage, old/loose/corroded/cheap/bad connections and replace them if you do.
By moving the modem, you've ensured the lines in the home isn't causing the issue. If when you move it, the signal improves and your issues clear up, then you know its the wiring in the home and not from the isp. So get a screen snip now and when you move it to compare.
Re: AC1200 C6230 Modem/Router Drops Internet Several TImes per Day, Have to Restart
Thanks for the response. I just moved into this house I'm renting at the beginning of September. There is only one cable in the house, my desk is right next to it. No splitters or anything else on the cable line, which is buried in the wall. The modem is as close to the cable as is possible. My main device is a desktop computer, and I run an ethernet cable from the modem/router directly into the computer. The only other active device is my phone, which is on the WiFi signal. When the Internet cuts out both the computer and phone drop the internet connection, so it's impacting the WiFi and ethernet the same way. This is the cable connections page and most recent event log:
Frequency start Value
This field below allows you to modify the frequency the cable modem start with its scan during initialization and registration. Enter the new start frequency and restart the cable modem for it to take effect.
Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=94:a6:7e:cf:7d:4c;CMTS-MAC=00:01:5c:6f:c2:78;CM-QOS=1.1;CM-VER=3.0;
2021-10-10, 17:04:52.0
Critical (3)
Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=94:a6:7e:cf:7d:4c;CMTS-MAC=00:01:5c:6f:c2:78;CM-QOS=1.1;CM-VER=3.0;
Time Not Established
Notice (6)
Honoring MDD; IP provisioning mode = IPv6
Time Not Established
Critical (3)
No Ranging Response received - T3 time-out;CM-MAC=94:a6:7e:cf:7d:4c;CMTS-MAC=00:01:5c:6f:c2:78;CM-QOS=1.0;CM-VER=3.0;
Re: AC1200 C6230 Modem/Router Drops Internet Several TImes per Day, Have to Restart
Your power levels look pretty spot on.
You can get some t3/t4 errors when its first booting/connecting and you have that.
And you don't have any errors. If this was booted up yesterday and your not showing errors and just the bootup t3/t4, it'd keep watching it until you get the errors, then log in and get the logs/signal connections.
Sometimes it can be an intermittent issue. I had a guy that only had issues when the wind was blowing to hard because it'd blow his coax cable (run overhead) into some trees and a hole had worn into the cable.
but so far the signal doesn't look to bad. Who's your isp?
Re: AC1200 C6230 Modem/Router Drops Internet Several TImes per Day, Have to Restart
My provider is Xfinity/Comcast. The modem they rent out is a 3.1, my modem/router is Docsis 3.0. Could that be the issue? I bought the modem/router myself. I can still return the modem/router but only have a few more days before I'm stuck with it. Should I buy a 3.1 docsis modem/router? I don't really know what the difference is between 3.0 and 3.1, could you offer a brief explanation? Thanks again for your help 🙂
Re: AC1200 C6230 Modem/Router Drops Internet Several TImes per Day, Have to Restart
Docsis 3.1 has higher throughput and more ISP's are requiring it for decent speeds. For examply, cox recently started pushing it for speed tiers over 150mbps. There's a bunch more info than that but quick google search can go into details.
If it was me? I'd return it and buy a docsis 3.1 modem only device. Then I'd buy a router.
the combo devices firmware is controlled by the isp and there isn't much for troubleshooting to see if its a modem issue versus a router issue. It tends to have a higher upfront cost (for same specs devices) but leaves you in control of your firmware as well as allows you to upgrade just 1 piece of it if you're needing improved speeds. but it is a significant cost increase going from docsis 3.0 equipment to docsis 3.1
Is that whats causing the problem though? Tough to really know.
An option worth trying?
Return the C6230 and rent xfinity's modem/router device for a month. Might cost you $10-20. But if it works well, then you know the line is fine and can look around for a docsis 3.1 device. If it doesn't work well, xfinity can't blame the device because if 2x 3rd party devices had issues and so does theirs, then it doesn't leave much besides the line.
Re: AC1200 C6230 Modem/Router Drops Internet Several TImes per Day, Have to Restart
Tech came out today, no charge thankfully. The splitter had water damage outside the house and we replaced the main cable line running into the house as well. The cable running into the modem was really old. Everything is working well now. The modems weren't the issue.
