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user_qq80vf
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Saturday, August 9th, 2025

Internet stops working exactly every 10 minutes

I am having a problem were exactly every 10 minutes I loose internet connection.
I have tried restarting both my modem and router several times and have even tried moving the modem to the point where the coax comes into the house.
The lose of connection perfectly correlates with the following logs from the modem.

Fri Aug 08 20:26:31 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 11 13; New Profile: 10 13.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
Fri Aug 08 20:26:01 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 12 13; New Profile: 11 13.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;
Fri Aug 08 20:25:31 2025 (Notice (6)) US profile assignment change. US Chan ID: 41; Previous Profile: 10 13; New Profile: 12 13.;CM-MAC=xx:xx:xx:xx:xx:xx;CMTS-MAC=xx:xx:xx:xx:xx:xx;CM-QOS=1.1;CM-VER=3.1;

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13 days ago

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EG

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17 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.

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user_qq80vf

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Downstream Bonded Channels
Channel LockedStatus Modulation ChannelID  Frequency     Power    SNR   Correctables Uncorrectables     
      1     Locked     QAM256     28     543000000 Hz     6.4     43.4     0     0
      2     Locked     QAM256     13     453000000 Hz     7.7     44.3     0     0
      3     Locked     QAM256     14     459000000 Hz     7.9     44.3     0     0
      4     Locked     QAM256     15     465000000 Hz     7.8     44.2     0     0
      5     Locked     QAM256     16     471000000 Hz     8     44.4     0     0
      6     Locked     QAM256     17     477000000 Hz     7.9     44.3     0     0
      7     Locked     QAM256     18     483000000 Hz     7.7     44.2     0     0
      8     Locked     QAM256     19     489000000 Hz     7.4     44     0     0
      9     Locked     QAM256     20     495000000 Hz     7.4     44.1     0     0
     10     Locked     QAM256     21     501000000 Hz     7.1     43.8     0     0
     11     Locked     QAM256     22     507000000 Hz     7     43.8     0     0
     12     Locked     QAM256     23     513000000 Hz     7.1     43.9     0     0
     13     Locked     QAM256     24     519000000 Hz     7.1     43.8     0     0
     14     Locked     QAM256     25     525000000 Hz     6.9     43.7     0     0
     15     Locked     QAM256     26     531000000 Hz     6.8     43.6     0     0
     16     Locked     QAM256     27     537000000 Hz     6.5     43.4     0     0
     17     Locked     QAM256     29     549000000 Hz     6.3     43.3     0     0
     18     Locked     QAM256     30     555000000 Hz     6.4     43.3     0     0
     19     Locked     QAM256     31     561000000 Hz     6.7     43.5     0     0
     20     Locked     QAM256     32     567000000 Hz     6.6     43.4     0     0
     21     Locked     QAM256     33     573000000 Hz     6.5     43.3     0     0
     22     Locked     QAM256     34     579000000 Hz     6.4     43.3     0     0
     23     Locked     QAM256     35     585000000 Hz     6.1     43.2     0     0
     24     Locked     QAM256     36     591000000 Hz     6.2     43.2     0     0
     25     Locked     QAM256     37     597000000 Hz     6.2     43.2     0     0
     26     Locked     QAM256     38     603000000 Hz     6.5     43.4     0     0
     27     Locked     QAM256     39     609000000 Hz     6.8     43.6     0     0
     28     Locked     QAM256     40     615000000 Hz     6.8     43.6     0     0
     29     Locked     QAM256     41     621000000 Hz     6.7     43.5     0     0
     30     Locked     QAM256     42     627000000 Hz     6.2     43.2     0     0
     31     Locked     QAM256     43     633000000 Hz     6.2     43.3     0     0
     32     Locked     QAM256     44     639000000 Hz     6.2     43     0     0

Upstream Bonded Channels
Channel   LockedStatus  ChannelType ChannelID   SymbolRate        Frequency       Power     
      1       Locked       ATDMA      1       5120 Ksym/sec       16400000 Hz       46.3 dBmV
      2       Locked       ATDMA      2       5120 Ksym/sec       22800000 Hz       46.3 dBmV
      3       Locked       ATDMA      3       5120 Ksym/sec       29200000 Hz       45.5 dBmV
      4       Locked       ATDMA      4       5120 Ksym/sec       35600000 Hz       44.8 dBmV
      5       Not Locked       Unknown      0       0       0       0.0
      6       Not Locked       Unknown      0       0       0       0.0
      7       Not Locked       Unknown      0       0       0       0.0
      8       Not Locked       Unknown      0       0       0       0.0

Downstream OFDM Channels
Channel   LockedStatus  ProfileID  ChannelID    Frequency       Power       SNR/MER    ActiveSubcarrier    Unerror    Correctable   Uncorrectable
      1     Locked     0 ,1 ,2 ,3     193     690000000 Hz     6.38 dBmV     42.6 dB     388 ~ 3707     23798778     19054095     0
      2     Locked     0 ,1 ,2 ,3     194     957000000 Hz     3.88 dBmV     40.3 dB     148 ~ 3947     23815508     12100969     78

Upstream OFDMA Channels
Channel   LockedStatus    ProfileID    ChannelID    Frequency       Power
      1     Locked     10 ,13     41     36200000 Hz     34.3 dBmV
      2     Not Locked     0      0     0 Hz     0 dBmV

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13 days ago

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EG

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13 days ago

The values were ok at that snapshot in time. Are there any more error log entries other than those three being shown ? If so, please post them as well in their entirety.  Redact any CM MAC and the CMTS MAC addresses

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user_qq80vf

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The same set of 3 errors would repeat every 10 minutes. The problem seems like it might have only effected the upload speed based on what I experienced during the time the errors occurred in games and voice calls. I swapped to an older docsis 3.0 modem and the problem stopped but the upload speed is 6 times slower than what I used to reach on the older 3.0 modem.

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13 days ago

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EG

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13 days ago

Ok so those error log entries look like there may be noise ingress into the line(s) / an upstream channel / return path impairment somewhere.


There are other signal stat values that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.


I'm going to escalate your issue to the Comcast corporate employees (The Digital Care Team) who are available to these boards. They will be able to poll the CMTS (Cable Modem Termination System) to check for any real-time degradation and / or error reports, see your node / cable plant, and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and check those upstream receive signal stats.

You should get a reply here in your topic. Good luck !

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