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tjb99
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Tuesday, May 5th, 2026 12:40 AM

Internet drops for 5-10 seconds

Hi! I've had issues with my internet lately. It will randomly drop all connections for 5-10 seconds one or more times and hour. It is not exactly a new issue, but has been a lot more frequent recently. I have a netgear CM1200 modem and R6230 router, which I believe are still in spec for my xfinity plan, though I believe the router is technically "old" now, according to netgear that is always trying to sell me a new one. Firmware is updated on both. I have tried multiple coax cables going from my wall to my modem, but I live in an apartment and don't have access to anything else really. 

Within the half-hour since I last rebooted, I have seen dozens of the two errors below.

RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-MAC=[Edited: "Personal Information"];CMTS-MAC=[Edited: "Personal Information"];CM-QOS=1.1;CM-VER=3.1;

"Dynamic Range Window violation"

And a few of the below:

"16 consecutive T3 timeouts while trying to range on upstream"

I have seen mention of the stats below on other forum posts, So putting them here. Is there anything I can do?

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 2 5120 Ksym/sec 16300000 Hz 44 dBmV
2 Locked ATDMA 3 5120 Ksym/sec 22800000 Hz 44.8 dBmV
3 Locked ATDMA 4 5120 Ksym/sec 29200000 Hz 45 dBmV
4 Locked ATDMA 5 5120 Ksym/sec 35600000 Hz 44.5 dBmV
5 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
6 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables
1 Locked QAM256 13 507000000 Hz 1.5 dBmV 43.3 dB 1054 3337
2 Locked QAM256 1 429000000 Hz -4.4 dBmV 40 dB 1263 4698
3 Locked QAM256 2 435000000 Hz -7.3 dBmV 38.2 dB 1121 4605
4 Locked QAM256 3 441000000 Hz -7.6 dBmV 38.2 dB 1181 4574
5 Locked QAM256 4 447000000 Hz -5.9 dBmV 39.7 dB 1421 5121
6 Locked QAM256 5 453000000 Hz -4 dBmV 41 dB 1203 5190
7 Locked QAM256 6 459000000 Hz -2.6 dBmV 41.8 dB 2501 10703
8 Locked QAM256 7 465000000 Hz -1.6 dBmV 42.2 dB 3504 14884
9 Locked QAM256 8 471000000 Hz -0.9 dBmV 42.4 dB 2381 10337
10 Locked QAM256 9 477000000 Hz -0.3 dBmV 42.6 dB 1546 4738
11 Locked QAM256 10 483000000 Hz 0.1 dBmV 42.7 dB 1852 6189
12 Locked QAM256 11 489000000 Hz 0.6 dBmV 43 dB 1366 5437
13 Locked QAM256 12 495000000 Hz 0.8 dBmV 43.1 dB 1482 5872
14 Locked QAM256 14 513000000 Hz 1.9 dBmV 43.4 dB 1908 5523
15 Locked QAM256 15 519000000 Hz 1.9 dBmV 43.3 dB 1808 5685
16 Locked QAM256 16 525000000 Hz 2.1 dBmV 43.3 dB 1735 5804
17 Locked QAM256 17 531000000 Hz 2.1 dBmV 43.2 dB 1662 6641
18 Locked QAM256 18 537000000 Hz 2.3 dBmV 43.2 dB 2024 8058
19 Locked QAM256 19 543000000 Hz 2.2 dBmV 43.2 dB 1765 7296
20 Locked QAM256 20 549000000 Hz 2.4 dBmV 43.3 dB 2482 10034
21 Locked QAM256 21 555000000 Hz 2.2 dBmV 43.3 dB 4171 17061
22 Locked QAM256 22 561000000 Hz 2.3 dBmV 43.2 dB 5165 15654
23 Locked QAM256 23 567000000 Hz 1.9 dBmV 43.1 dB 5694 7987
24 Locked QAM256 24 573000000 Hz 1.7 dBmV 43 dB 2182 6815
25 Locked QAM256 25 579000000 Hz 1.4 dBmV 42.8 dB 1939 6331
26 Locked QAM256 26 585000000 Hz 1.2 dBmV 42.6 dB 1968 6835
27 Locked QAM256 27 591000000 Hz 1 dBmV 42.5 dB 2024 6660
28 Locked QAM256 42 405000000 Hz 4 dBmV 43.8 dB 715 3068
29 Locked QAM256 43 411000000 Hz 3 dBmV 43.4 dB 2028 6981
30 Locked QAM256 44 417000000 Hz 1.3 dBmV 42.8 dB 2341 7111
31 Locked QAM256 45 423000000 Hz -1.3 dBmV 41.7 dB 3557 16397
32 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0

Question

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Updated 

9 hours ago

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XfinityLinda

Official Employee

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2.5K Messages

9 hours ago

Thanks for reaching out today, @tjb99, for assistance with your internet connection. We're sorry to hear about the trouble. I do show your CM1200 modem is compatible. Have you tried to troubleshoot without the router connected? Did you check to make sure the coaxial cabling isn't damaged, bent, or very old? Have you swapped the ethernet cables and splitters (if in use) to see if the connection improved? All of this can interfere with the connection. 

 

Here: https://www.xfinity.com/support/articles/internet-connectivity-troubleshooting is a helpful article for troubleshooting.

(edited)

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