Significantly Reduced Download Speeds after 7:30AM

[SteveAustin]

Hi all;

Thanks in advance for any responses. I've tried to include all diagnostic data requested in similar threads, I'll respond ASAP to add anything I've missed.

Follow-up post(s) to include frequently requested hub status / logs.

Area Reference - 30

Broadband Package - M100

Issue Summary

Since Wednesday, 1st September 2021 we've experienced much slower download speeds than we normally receive. Before this, with a wired connection, we'd receive anywhere between 80-100 Mbps download at all times of the day.

- Download speeds are reduced across the board. Our new "peak" is speeds of between 40-66Mbps Down.

- This peak is only available between sometime after midnight and approximately 7:30AM

- Once 7:30AM nears - download speeds are reduced further to 2-4Mbps. This range is then maintained until gone midnight.

- This cycle has repeated itself for 6-days straight.

Throughout this, our Upload speeds have remained unchanged, averaging around the advertised 10mbps for our particular package.

Relevant points of note:

- Hub 3.0. Rebooted/ reset numerous times. Hub & device left off completely for 30-mins.

- Testing whilst connected by a Cat6 ethernet cable, directly from desktop to Hub. I've also since replaced this ethernet cable with a new Cat8 cable from a trusted brand via Amazon.

- All cables checked and confirmed to be securely connected. As far as I can tell everything looks in good condition, including splitter & coaxial.

- Speed tests ran on 3 different devices. Speed test ran whilst in safe mode. Speed test all additionally tested via both Wi-Fi & a Powerline adapter. All scenarios share the same pattern of reduced speeds.

- Tried connecting to all 4 ports on Hub 3.0. Same patterns regardless of which port is used.

- No changes to device/ hub setup, no increase in connected devices. Regularly average 5 connected devices, with only one of these devices being what I'd consider as a 'heavy' user.

- Checked 'local status' and no issues have been reported.

- Virgin Media customer for over a decade and this is the only prolonged internet issue I can recall, other than scheduled infrastructure maintenance. 

Broadband Quality Monitor over last 24 hours (packet losses reflect when the hub was switched off)

Speedtest.net download speed patterns over the last 3 days:

Thanks!

[SteveAustin]

Cable Modem StatusItem Status Comments

Acquired Downstream Channel (Hz)	331000000	Locked
Ranged Upstream Channel (Hz)	60299976	Locked
Provisioning State	Online

Downstream bonded channelsChannel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID

1	331000000	3	40	256 qam	25
2	203000000	4.5	38	256 qam	9
3	211000000	4.8	38	256 qam	10
4	219000000	4.3	38	256 qam	11
5	227000000	4.3	40	256 qam	12
6	235000000	4.3	40	256 qam	13
7	243000000	4.1	38	256 qam	14
8	251000000	3.7	38	256 qam	15
9	259000000	3.9	38	256 qam	16
10	267000000	4	38	256 qam	17
11	275000000	4.1	40	256 qam	18
12	283000000	3.7	40	256 qam	19
13	291000000	3.5	38	256 qam	20
14	299000000	4	38	256 qam	21
15	307000000	4	40	256 qam	22
16	315000000	3.7	40	256 qam	23
17	323000000	3	38	256 qam	24
18	339000000	2.7	38	256 qam	26
19	347000000	2.7	38	256 qam	27
20	355000000	2.2	38	256 qam	28
21	363000000	2	40	256 qam	29
22	371000000	1.9	40	256 qam	30
23	379000000	2	38	256 qam	31
24	387000000	1.7	38	256 qam	32

Downstream bonded channelsChannel Locked Status RxMER (dB) Pre RS Errors Post RS Errors

1	Locked	40.3	0	0
2	Locked	38.9	5	0
3	Locked	38.6	5	0
4	Locked	38.9	4	0
5	Locked	40.3	7	0
6	Locked	40.9	5	0
7	Locked	38.9	4	0
8	Locked	38.9	5	0
9	Locked	38.9	6	0
10	Locked	38.6	7	0
11	Locked	40.9	5	0
12	Locked	40.3	7	0
13	Locked	38.9	6	0
14	Locked	38.9	5	0
15	Locked	40.3	6	0
16	Locked	40.3	4	0
17	Locked	38.9	5	0
18	Locked	38.9	4	0
19	Locked	38.9	6	0
20	Locked	38.9	4	0
21	Locked	40.3	6	0
22	Locked	40.3	5	0
23	Locked	38.9	5	0
24	Locked	38.9	6	0

Upstream bonded channelsChannel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID

1	60299976	43.8	5120	64 qam	1
2	39400000	41.8	5120	64 qam	4
3	46200002	42.3	5120	64 qam	3
4	53699983	43.8	5120	64 qam	2

Upstream bonded channelsChannel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts

1	ATDMA	0	0	1	0
2	ATDMA	0	0	0	0
3	ATDMA	0	0	0	0
4	ATDMA	0	0	0	0

General Configuration

Network access	Allowed
Maximum Number of CPEs	1
Baseline Privacy	Enabled
DOCSIS Mode	Docsis30
Config file	834ncxv9873254k;fg87dsfd;

Primary Downstream Service Flow

SFID	4272
Max Traffic Rate	117000047
Max Traffic Burst	42600
Min Traffic Rate	0

Primary Upstream Service Flow

SFID	4176
Max Traffic Rate	10500047
Max Traffic Burst	16320
Min Traffic Rate	0
Max Concatenated Burst	16320
Scheduling Type	BestEffort

[SteveAustin]

Network Log

Time Priority Description

06/09/2021 07:45:46	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
01/01/1970 00:01:38	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
06/09/2021 05:40:19	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
04/09/2021 15:39:53	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
04/09/2021 15:39:26	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
01/01/1970 00:01:36	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
03/09/2021 13:21:21	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
03/09/2021 13:20:57	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
03/09/2021 13:12:14	notice	Unit has been restored to factory defaults from a software issued command;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
03/09/2021 07:25:51	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
03/09/2021 07:25:35	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
01/01/1970 00:01:38	critical	No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;
02/09/2021 15:08:49	notice	LAN login Success;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0;

[lotharmat]

Stats look A-OK - the BQM however..............

Damn....................

Major problems!

VM staff will be along shortly to advise - Maybe one of the VIPs can flag for a member of staff - I don't think that a call to CS will do anything as the stats look great!

[SteveAustin]

Happy coincidence but after running a speed test at 2PM, it looks like whatever issue was has (at least temporarily) been resolved after 6-days out in the desert. Seeing 90Mbps down which is good enough for me - Can park this thread for the time being, and hopefully I won't have to revisit!

For anybody following this thread after the fact, unfortunately I'm none the wiser as to what the issue was, and hadn't made any changes (other than rebooting the Hub every so often) to alleviate the problem. If I uncover anything, I'll add to this thread.

Will keep the BQM running as it may be useful to compare/ contrast if needed.

[lotharmat]

Thanks for letting us know!

Deffo keep the BQM running - Monitor it periodically in case your WAN IP changes - always worth having evidence to back up any drops!

[Martin_N]

Hi SteveAustin,

Thank you for your post and welcome to the community. 

I'm very sorry to hear about the issues you were having with your broadband issue.

I am happy to hear it all seems to be working now though. 

I have locate your account and taken a look on our side and nothing seems to be showing that could be affecting this. 

Please do let us know if these any change on this. 

^Martin