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daily internet dropouts
I am getting daily , sometimes twice or 3 times daily dropouts, The modem changes profile twice , gets a MDD and/or T3 timeout, drops the connection, causes the router to drop the connection due to poor signal , reconnects then I have to reboot the router to reconnect to the internet.
Logs, below for one such event today.. I get 2 to 3 a day. sometimes hours apart, sometimes within minutes of each other. The drops all happen at the T3 timeout. Router reports poor connection to the modem, and I get no internet until i reboot the router. The modem seems to reset itself but doesnt push new dhcp info, even when requested from the router. Mac Addresses removed to protect the innocent..
| Sun Aug 17 19:04:32 2025 | (Notice (6)) | CM-STATUS message sent. Event Type Code: 4; Chan ID: 28 194; DSID: N/A; MAC Addr: N/A; OFDM/OFDMA Profile ID: N/A.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; |
| Sun Aug 17 19:04:27 2025 | (Critical (3)) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; |
| Sun Aug 17 19:04:27 2025 | (Warning (5)) | MDD message timeout;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; |
| Sun Aug 17 19:01:33 2025 | (Notice (6)) | US profile assignment change. US Chan ID: 43; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=:09:40;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; |
| Sun Aug 17 19:00:48 2025 | (Notice (6)) | US profile assignment change. US Chan ID: 43; Previous Profile: 11 13; New Profile: 12 13.;CM-MAC=;CMTS-MAC=;CM-QOS=1.1;CM-VER=3.1; |
EG
Expert
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112.7K Messages
2 days ago
What do the modem's signal status values look like ? Try getting them here; http://192.168.100.1 or here http://10.0.0.1
Please copy all of the text in its entirety of the *Downstream Power Levels*, the *SNR's* (Signal to Noise Ratios), and the *Upstream Power Level* numbers and paste them into your next post.
What is the exact make and model number of the modem / gateway device ?
Also. If there are more error log entries being shown, please post the balance of them.
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EG
Expert
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112.7K Messages
2 days ago
This may or may not be the root cause of the problem (YMMV) but it should be addressed regardless.
The downstream power is a bit on the low / weaker side and it may be intermittently fluctuating even lower to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, latency problems, and the un-bonding of channels.
In an effort to try to obtain better connectivity / more wiggle room, check to see if there are any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/reconfigured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage from Home Depot, Target, Wal-Mart, etc. Splitters should be swapped with known to be good / new ones to test.
Also, check the coax cable for any damage such as cuts, nicks, abrasions, kinks, sharp bends, or animal chews.
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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