Internet drops out briefly often.

Question

My internet connection has started being interrupted multiple times a day, when investigating I noticed the below.

Started seeing a lot of these in my modem log:

19:10:10 Sat Aug 8 2020		Warning (5)		Dynamic Range Window violation
	19:10:10 Sat Aug 8 2020		Warning (5)		RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;QOS=1.1;CM-VER=3.1;
	19:10:10 Sat Aug 8 2020		Warning (5)		Dynamic Range Window violation
	19:10:10 Sat Aug 8 2020		Warning (5)		RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;;CM-QOS=1.1;CM-VER=3.1;
	19:10:10 Sat Aug 8 2020		Warning (5)		Dynamic Range Window violation
	19:10:10 Sat Aug 8 2020		Warning (5)		RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;;CM-QOS=1.1;CM-VER=3.1;
	19:10:10 Sat Aug 8 2020		Warning (5)		Dynamic Range Window violation
	19:19:41 Sat Aug 8 2020		Critical (3)		Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-QOS=1.1;CM-VER=3.1;
	19:23:29 Sat Aug 8 2020		Warning (5)		RNG-RSP CCAP Commanded Power Exceeds Value Corresponding to the Top of the DRW;CM-QOS=1.1;CM-VER=3.1;
	19:23:29 Sat Aug 8 2020		Warning (5)		Dynamic Range Window violation
	19:33:00 Sat Aug 8 2020		Warning (5)		RNG-RSP CCAP Commanded Power in Excess of 6 dB Below the Value Corresponding to the Top of the DRW;CM-QOS=1.1;CM-VER=3.1;

Meguas · Accepted Answer

Had another tech out today (he seemed much better and was asking the right questions as opposed to my first tech). He found at the tap (I live in a condo so it's just a box on the ground feeding a bunch of homes) that the neighbor's coax had a gash in it and my old coax run to my house (bad line from many years ago) was still plugged in which was probably introducing all sorts of noise.

I will give it a couple of days to see if the issue returns but so far it's been 8+ hours with no uncorrected errors and no time outs.

Meguas · Answer

Anyone able to assist?

Meguas · Answer

So I had a tech come out and he ended up blaming my inside wiring saying that there is some noise on the lines... which isn't surprising as they are really old. So, that will be my weekend project to replace the coax cables in the house.

I am still not 100% convinced this is going to solve the problem but it's a start.

Meguas · Answer

Looks like before I got a chance to do my wiring (doing that today) there was a maintenance on the node which cleaned up a lot of the noise.

Meguas · Answer

Replaced all inside wiring today even though I think the Comcast maintenance fixed my issues. So far no uncorrected errors and the signal levels look a bit better as well.

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Freq. (MHz)	Pwr (dBmV)	SNR (dB)	Corrected	Uncorrected
1	Locked	QAM256	26	597.0	3.6	43.1	0	0
2	Locked	QAM256	1	441.0	3.8	43.4	0	0
3	Locked	QAM256	2	453.0	3.6	43.3	0	0
4	Locked	QAM256	3	459.0	3.7	43.2	0	0
5	Locked	QAM256	4	465.0	3.9	43.1	0	0
6	Locked	QAM256	5	471.0	3.6	43.4	0	0
7	Locked	QAM256	6	477.0	3.8	43.3	0	0
8	Locked	QAM256	7	483.0	3.7	43.4	0	0
9	Locked	QAM256	8	489.0	3.5	43.4	0	0
10	Locked	QAM256	9	495.0	3.8	43.4	0	0
11	Locked	QAM256	10	501.0	3.8	43.5	0	0
12	Locked	QAM256	11	507.0	3.6	43.4	0	0
13	Locked	QAM256	12	513.0	3.8	43.4	0	0
14	Locked	QAM256	13	519.0	4.0	43.6	0	0
15	Locked	QAM256	14	525.0	3.4	43.1	0	0
16	Locked	QAM256	15	531.0	3.5	43.2	0	0
17	Locked	QAM256	16	537.0	3.6	43.5	0	0
18	Locked	QAM256	17	543.0	3.2	43.2	0	0
19	Locked	QAM256	18	555.0	3.3	43.3	0	0
20	Locked	QAM256	19	561.0	3.1	43.2	0	0
21	Locked	QAM256	20	567.0	3.4	43.2	0	0
22	Locked	QAM256	21	573.0	3.5	43.2	0	0
23	Locked	QAM256	22	579.0	3.4	43.2	0	0
24	Locked	QAM256	23	585.0	3.3	43.1	0	0
25	Locked	QAM256	24	591.0	3.7	43.2	0	0
26	Locked	OFDM PLC	25	693.0	3.4	41.0	13213220	0
27	Locked	QAM256	27	603.0	3.6	43.2	0	0
28	Locked	QAM256	28	609.0	3.6	43.1	0	0
29	Locked	QAM256	29	615.0	3.2	42.6	0	0
30	Locked	QAM256	30	621.0	3.2	42.9	0	0
31	Locked	QAM256	31	627.0	3.3	42.8	0	0
32	Locked	QAM256	32	633.0	3.0	42.6	0	0

Upstream Bonded Channels

Channel	Lock Status	Channel Type	Channel ID	Symb. Rate (Ksym/sec)	Freq. (MHz)	Pwr (dBmV)
1	Locked	SC-QAM	5	5120	36.5	43.5
2	Locked	SC-QAM	6	5120	30.1	43.3
3	Locked	SC-QAM	7	5120	23.7	43.0
4	Locked	SC-QAM	8	5120	17.3	43.3

Meguas · Answer

Details here in my past thread:https://forums.xfinity.com/t5/Your-Home-Network/Internet-drops-out-briefly-often/m-p/3363739 I replaced all my inside wiring since the tech that came out said he saw some noise on the line even though I know there was a node issue causing significatant errors in my area (a maintenance cleared this up apparently).    But I am still getting uncorrected errors on my modem log with brief internet cutouts which is impacting my work from home ability.From what I can tell all my signal levels are within spec and look really good, so I am not sure what the next step to take here would be.Downstream Bonded Channels          ChannelLock StatusModulationChannel IDFreq. (MHz)Pwr (dBmV)SNR (dB)CorrectedUncorrected   1LockedQAM25626597.02.543.0881   2LockedQAM2561441.02.543.37178   3LockedQAM2562453.02.343.15490   4LockedQAM2563459.02.543.37587   5LockedQAM2564465.02.743.25185   6LockedQAM2565471.02.443.14187   7LockedQAM2566477.02.743.06482   8LockedQAM2567483.02.743.33874   9LockedQAM2568489.02.443.42991   10LockedQAM2569495.02.643.31189   11LockedQAM25610501.02.743.44578   12LockedQAM25611507.02.443.34285   13LockedQAM25612513.02.843.53275   14LockedQAM25613519.02.943.62577   15LockedQAM25614525.02.342.33476   16LockedQAM25615531.02.543.23491   17LockedQAM25616537.02.543.24472   18LockedQAM25617543.02.243.02978   19LockedQAM25618555.02.343.32880   20LockedQAM25619561.02.043.11977   21LockedQAM25620567.02.443.21183   22LockedQAM25621573.02.743.14076   23LockedQAM25622579.02.643.31477   24LockedQAM25623585.02.743.31083   25LockedQAM25624591.02.843.21479   26LockedOFDM PLC25693.02.841.0369986150   27LockedQAM25627603.02.743.0981   28LockedQAM25628609.02.943.02271   29LockedQAM25629615.02.543.01674   30LockedQAM25630621.02.442.81379   31LockedQAM25631627.02.642.91573   32LockedQAM25632633.02.242.93365   Upstream Bonded Channels          ChannelLock StatusChannel TypeChannel IDSymb. Rate (Ksym/sec)Freq. (MHz)Pwr (dBmV)   1LockedSC-QAM5512036.546.0   2LockedSC-QAM6512030.145.8   3LockedSC-QAM7512023.745.5   4LockedSC-QAM8512017.345.5

Meguas · Answer

Still getting a lot of uncorrected errors, anyone have any ideas? Maybe I should try and get a line tech to check things?

Downstream Bonded Channels

Channel	Lock Status	Modulation	Channel ID	Freq. (MHz)	Pwr (dBmV)	SNR (dB)	Corrected	Uncorrected
1	Locked	QAM256	26	597.0	2.5	43.1	1665	3072
2	Locked	QAM256	1	441.0	2.2	43.3	2820	4155
3	Locked	QAM256	2	453.0	2.1	43.3	2832	4075
4	Locked	QAM256	3	459.0	2.3	43.4	2681	3864
5	Locked	QAM256	4	465.0	2.5	43.4	2747	3854
6	Locked	QAM256	5	471.0	2.2	43.4	2696	3903
7	Locked	QAM256	6	477.0	2.5	43.5	2608	3982
8	Locked	QAM256	7	483.0	2.5	43.4	2377	3817
9	Locked	QAM256	8	489.0	2.2	43.4	2341	3848
10	Locked	QAM256	9	495.0	2.5	43.4	2430	3944
11	Locked	QAM256	10	501.0	2.5	43.1	2278	3631
12	Locked	QAM256	11	507.0	2.3	43.4	2183	3722
13	Locked	QAM256	12	513.0	2.7	43.5	2138	3665
14	Locked	QAM256	13	519.0	2.8	43.7	1916	3390
15	Locked	QAM256	14	525.0	2.2	41.9	2155	3451
16	Locked	QAM256	15	531.0	2.4	43.0	1782	3600
17	Locked	QAM256	16	537.0	2.5	43.5	1997	3344
18	Locked	QAM256	17	543.0	2.1	43.1	1891	3543
19	Locked	QAM256	18	555.0	2.3	43.2	1733	3466
20	Locked	QAM256	19	561.0	2.0	43.0	1839	3380
21	Locked	QAM256	20	567.0	2.4	43.3	1793	3321
22	Locked	QAM256	21	573.0	2.7	43.5	1765	3436
23	Locked	QAM256	22	579.0	2.6	43.4	1721	3438
24	Locked	QAM256	23	585.0	2.7	43.3	1734	3263
25	Locked	QAM256	24	591.0	2.9	43.2	1633	3198
26	Locked	OFDM PLC	25	693.0	2.9	41.2	413499689	137
27	Locked	QAM256	27	603.0	2.8	43.3	1575	3101
28	Locked	QAM256	28	609.0	3.0	43.1	1437	3058
29	Locked	QAM256	29	615.0	2.6	43.0	1459	3060
30	Locked	QAM256	30	621.0	2.5	43.0	1552	3012
31	Locked	QAM256	31	627.0	2.6	42.9	1426	2967
32	Locked	QAM256	32	633.0	2.3	42.7	1529	2959

Upstream Bonded Channels

Channel	Lock Status	Channel Type	Channel ID	Symb. Rate (Ksym/sec)	Freq. (MHz)	Pwr (dBmV)
1	Locked	SC-QAM	5	5120	36.5	50.3
2	Locked	SC-QAM	6	5120	30.1	50.0
3	Locked	SC-QAM	7	5120	23.7	49.8
4	Locked	SC-QAM	8	5120	17.3	50.0

Meguas · Answer

Lucky for me my speeds throughout all of this have been just fine, it's just the disconnects and uncorrected errors that I am trying to track down now.

I am starting to wonder if it's my modem that is to blame, I have a MB8600 which I can see on reviews does suffer from disconnects.... but every DOCSIS 3.1 modem seems to have people saying that.

bob9556 · Answer

I have been having problems with this in westminster for over a week. I speed test and it is doing

.072 download and .33 upload. One hour later it may be doin 100 mb down and 35 upload. it has been up and down same location and computer, then an hour or so later back down to junk. I am supposed to be getting 600, I know that is optomistic to expect that much.

Meguas · Answer

Does Comcast support monitor these forums?  Not a single response from them so far...

Meguas · Answer

The issue remains even with all my home coax replaced and my MoCA filter replaced.  Going to try and push Comcast to dispatch a line tech.

Meguas · Answer

Ok, it's been a week not a single uncorrected error.  This is resolved finally!

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Internet drops out briefly often.

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