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Frequent Internet Disconnects. Started Unicast Maintenance Ranging - No Response received - T3 time
As the title states, I am randomly losing internet connectivity rather frequently. Started 2-3 weeks ago. Multiple times per day, connectivity drops for approximately 2-10 minutes. During this time, internet connectivity to external websites drops first, followed by connectivity to the modem.
The modem is a Netgear C6250 (AC1600) modem, which is one of the xfinity approved modems with DOCSIS 3.0 for my internet package. Every time connectivity is lost, when I log into the modem and check the log, "Critical(3) Started Unicast Maintenance Ranging - No Response received - T3 time-out" is the most recent entry. The modem is connected to the coax outlet directly inside the house from where the coax from the pole enters the house. It is a direct connection, with no splitters, to the outside line.
In the process of troubleshooting, I have changed the cable, changed the modem, even asked for an Xfinity XFI (Nice new white modem) to see if this would solve the problem. I have eliminated and removed all other devices from my network and plugged my computer directly into the modem, and the problem still persists. Since COVID19, my wife and I have been working from home and this has been very annoying to keep getting dropped from meetings and calls, as well as teaching for my wife.
I will post the LOG as well as my Upstream and Downstream info.
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kevinmd007
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3 Messages
7 m ago
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kevinmd007
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7 m ago
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EG
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86.5K Messages
7 m ago
The dowstream power is too low and it may be intermittently fluctuating even lower out of spec. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test
If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.
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