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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.
10 Replies
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.
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. Starting Frequency <tabindex=-1>Startup Procedure</tabindex=-1>
Procedure Status Comment Acquire Downstream Channel 579000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Security Enable BPI+ IP Provisioning Mode Honor MDD IPv4 only <tabindex=-1>Downstream Bonded Channels</tabindex=-1>
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 17 579000000 Hz 7.4 dBmV 40.0 dB 0 0 2 Locked QAM256 3 489000000 Hz 7.4 dBmV 40.3 dB 0 0 3 Locked QAM256 4 495000000 Hz 7.5 dBmV 40.2 dB 0 0 4 Locked QAM256 5 507000000 Hz 7.5 dBmV 37.8 dB 0 0 5 Locked QAM256 6 513000000 Hz 7.8 dBmV 40.3 dB 0 0 6 Locked QAM256 7 519000000 Hz 7.4 dBmV 40.2 dB 0 0 7 Locked QAM256 8 525000000 Hz 7.6 dBmV 40.3 dB 0 0 8 Locked QAM256 9 531000000 Hz 7.3 dBmV 40.1 dB 0 0 9 Locked QAM256 10 537000000 Hz 7.3 dBmV 40.1 dB 0 0 10 Locked QAM256 11 543000000 Hz 7.0 dBmV 40.0 dB 0 0 11 Locked QAM256 12 549000000 Hz 7.1 dBmV 40.0 dB 0 0 12 Locked QAM256 13 555000000 Hz 7.0 dBmV 40.0 dB 0 0 13 Locked QAM256 14 561000000 Hz 7.3 dBmV 40.0 dB 0 0 14 Locked QAM256 15 567000000 Hz 7.4 dBmV 40.1 dB 0 0 15 Locked QAM256 16 573000000 Hz 7.1 dBmV 40.0 dB 0 0 16 Locked QAM256 18 585000000 Hz 6.6 dBmV 39.9 dB 0 0 <tabindex=-1>Upstream Bonded Channels</tabindex=-1>
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 1 5120 Ksym/sec 35600000 Hz 44.0 dBmV 2 Locked ATDMA 2 5120 Ksym/sec 29200000 Hz 43.0 dBmV 3 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 42.8 dBmV 4 Locked ATDMA 4 5120 Ksym/sec 16400000 Hz 42.8 dBmV 2021-10-11, 10:57:14.0 Critical (3) 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; 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?
Could be them pushing for docsis 3.1......
