Speed Drops from 200 Mbps to 1 Mbps or Less Daily

[HPEB17]

Sounds like we have very similar issues. My problems started on Saturday 11/9 out of the blue. Nothing had changed on my end at that time. No software or hardware changes. I did start to replace components that I had originally planned to replace. Ran new coax and a new splitter.

My power levels on my SB8200 are way out of spec, according to Arris.

CS on the phone could only reset my modem (this does not solve the issue, in fact after a reset factory or otherwise, the numbers all remain out of range) and scheduled a technician to come out to my house. I guess we'll see what happens Wednesday.

[EG]

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@HPEB17 wrote:

Sounds like we have very similar issues. My problems started on Saturday 11/9 out of the blue. Nothing had changed on my end at that time. No software or hardware changes. I did start to replace components that I had originally planned to replace. Ran new coax and a new splitter.

My power levels on my SB8200 are way out of spec, according to Arris.

CS on the phone could only reset my modem (this does not solve the issue, in fact after a reset factory or otherwise, the numbers all remain out of range) and scheduled a technician to come out to my house. I guess we'll see what happens Wednesday.

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Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

What is the exact model number of the Arris modem ?

Is this a WiFi connection ?

[HPEB17]

Update - 11/20/19

Tech just left my house. He needed to run a new line from the pole to the house. The old line was garbage! Also, it was full of water. Amazing that it last this long.

Anyhow I can now report my modem status power numbers are within acceptable range!

[HPEB17]

I did not see this was moved and ended up not seeing your question. It's a bit late now as the tech has left my house after running a new line. He ran a health check on my service prior to his arrival and already had seen the terrible signal levels.

I had power levels on my modem that ranged from -19 dBmV to -37 dBmV across 60% of my downstream bonded channels. This was obviously causing the havoc.

What I didn't know, that the tech showed me, was the line from the pole was absolute garbage. In fact, when he disconnected the line from the splitter to look at the connection, water poured out of the line.

I can report now that my downstream power is well within spec and my internet is working flawlessly. We'll see if it maintains (I have confidence it will) over the next 24 hours and I'll update if not.

----------------------

This is modem status from 11/17 -

11/17/19 17:10

Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
13 Locked QAM256 573000000 Hz -19.6 dBmV 31.4 dB 2135 23
1 Locked QAM256 495000000 Hz -10.3 dBmV 39.0 dB 8923 0
2 Locked QAM256 507000000 Hz -9.8 dBmV 39.3 dB 3362 165
3 Locked QAM256 513000000 Hz -10.6 dBmV 38.8 dB 2529 0
4 Locked QAM256 519000000 Hz -11.6 dBmV 38.1 dB 2601 0
5 Locked QAM256 525000000 Hz -12.4 dBmV 37.5 dB 2643 0
6 Locked QAM256 531000000 Hz -14.6 dBmV 35.6 dB 2858 9
7 Locked QAM256 537000000 Hz -14.7 dBmV 35.5 dB 3032 0
8 Locked QAM256 543000000 Hz -16.7 dBmV 33.8 dB 2626 0
10 Locked QAM256 555000000 Hz -17.5 dBmV 33.1 dB 2979 23
11 Locked QAM256 561000000 Hz -19.1 dBmV 31.8 dB 3010 31
12 Locked QAM256 567000000 Hz -18.7 dBmV 32.3 dB 1640 23
14 Locked QAM256 579000000 Hz -20.3 dBmV 30.6 dB 7315 21
15 Locked QAM256 585000000 Hz -20.2 dBmV 30.8 dB 37532 32
16 Locked QAM256 591000000 Hz -22.5 dBmV 28.3 dB 177057988 49837170
17 Locked QAM256 597000000 Hz -25.2 dBmV 0.0 dB 0 0
18 Not Locked Unknown 603000000 Hz -29.2 dBmV 0.0 dB 0 0
19 Not Locked Unknown 609000000 Hz -33.2 dBmV 0.0 dB 0 0
20 Not Locked Unknown 615000000 Hz -34.6 dBmV 0.0 dB 0 0
21 Not Locked Unknown 621000000 Hz -36.0 dBmV 0.0 dB 0 0
22 Not Locked Unknown 627000000 Hz -35.6 dBmV 0.0 dB 0 0
23 Not Locked Unknown 633000000 Hz -34.7 dBmV 0.0 dB 0 0
24 Not Locked Unknown 639000000 Hz -34.7 dBmV 0.0 dB 0 0
25 Locked Other 693000000 Hz -34.3 dBmV 0.0 dB 2936550 63690
26 Not Locked Unknown 0 Hz 0.0 dBmV 0.0 dB 0 0
27 Not Locked Unknown 645000000 Hz -33.5 dBmV 0.0 dB 0 0
28 Not Locked Unknown 651000000 Hz -34.2 dBmV 0.0 dB 0 0
29 Not Locked Unknown 657000000 Hz -33.4 dBmV 0.0 dB 0 0
30 Not Locked Unknown 663000000 Hz -33.1 dBmV 0.0 dB 0 0
31 Not Locked Unknown 669000000 Hz -34.1 dBmV 0.0 dB 0 0
32 Not Locked Unknown 675000000 Hz -33.4 dBmV 0.0 dB 0 0
33 Not Locked Unknown 681000000 Hz -34.5 dBmV 0.0 dB 0 0

Here are my current levels:

Downstream Bonded Channels
Channel ID Lock Status Modulation Frequency Power SNR/MER Corrected Uncorrectables
1 Locked QAM256 495000000 Hz 3.7 dBmV 41.4 dB 1068 696
2 Locked QAM256 507000000 Hz 3.7 dBmV 41.1 dB 3084 4080
3 Locked QAM256 513000000 Hz 4.1 dBmV 40.7 dB 2878 4060
4 Locked QAM256 519000000 Hz 4.2 dBmV 41.8 dB 2767 3814
5 Locked QAM256 525000000 Hz 4.0 dBmV 41.6 dB 2733 3506
6 Locked QAM256 531000000 Hz 4.2 dBmV 40.9 dB 2804 3611
7 Locked QAM256 537000000 Hz 4.4 dBmV 41.4 dB 2928 3460
8 Locked QAM256 543000000 Hz 4.5 dBmV 41.4 dB 2851 3410
9 Locked QAM256 549000000 Hz 4.2 dBmV 41.2 dB 2707 3479
10 Locked QAM256 555000000 Hz 4.4 dBmV 41.4 dB 2791 3553
11 Locked QAM256 561000000 Hz 4.3 dBmV 41.4 dB 2831 4296
12 Locked QAM256 567000000 Hz 4.4 dBmV 42.3 dB 2848 4197
13 Locked QAM256 573000000 Hz 4.0 dBmV 41.4 dB 2884 3966
14 Locked QAM256 579000000 Hz 3.5 dBmV 41.2 dB 2946 4090
15 Locked QAM256 585000000 Hz 3.4 dBmV 41.6 dB 2953 3757
16 Locked QAM256 591000000 Hz 3.1 dBmV 41.1 dB 3044 3541
17 Locked QAM256 597000000 Hz 2.5 dBmV 41.2 dB 3155 4769
18 Locked QAM256 603000000 Hz 2.2 dBmV 40.9 dB 2860 3792
19 Locked QAM256 609000000 Hz 1.9 dBmV 40.8 dB 2880 3591
20 Locked QAM256 615000000 Hz 1.9 dBmV 40.9 dB 2712 3546
21 Locked QAM256 621000000 Hz 1.7 dBmV 39.8 dB 2077 3187
22 Locked QAM256 627000000 Hz 1.7 dBmV 40.5 dB 2626 3410
23 Locked QAM256 633000000 Hz 1.8 dBmV 40.6 dB 2757 3971
24 Locked QAM256 639000000 Hz 1.9 dBmV 40.6 dB 2523 3564
25 Locked Other 693000000 Hz 23.2 dBmV 37.2 dB 14458994 249
26 Not Locked QAM256 0 Hz 0.0 dBmV 40.2 dB 2574 3196
27 Locked QAM256 645000000 Hz 1.9 dBmV 40.1 dB 2634 3335
28 Locked QAM256 651000000 Hz 1.8 dBmV 40.2 dB 2636 3264
29 Locked QAM256 657000000 Hz 1.6 dBmV 40.4 dB 2572 3094
30 Locked QAM256 663000000 Hz 1.7 dBmV 40.4 dB 2406 3263
31 Locked QAM256 669000000 Hz 1.7 dBmV 36.7 dB 2813 4185
32 Locked QAM256 675000000 Hz 1.3 dBmV 40.4 dB 2539 3140

Aside from the 1 channel, these numbers look good.

[EG · Accepted solution]

If you are referring to this channel;

25 Locked Other 693000000 Hz 23.2 dBmV 37.2 dB 14458994 249

That's the DOCSIS 3.1 / OFDM downstream channel for the gigabit speed tier. It is a known issue that some makes and models of modem read the signal stats for that channel incorrectly. You can disregard those figures.