Broadband Dropouts - slow speed– SYNC Timing Errors

I’m experiencing ongoing broadband dropouts that closely resemble the issues described in the following community threads:

Broadband connection keeps dropping
SYNC Timing Synchronization failure – Loss of Sync

My Virgin Media Hub is currently operating in modem mode, and I’m using an ASUS GT-AX11000 router to manage my home network. The dropouts affect both Wi-Fi and wired (LAN) devices, including critical appliances connected directly to the router.

Symptoms include:

Sudden and repeated loss of internet connectivity across all devices
Devices remain connected to the router but lose access to the internet
Dropouts occur randomly, sometimes multiple times per day
Router logs show normal operation, suggesting the issue is upstream

Given the similarity to the SYNC Timing Synchronization failures described in the community posts, I suspect this may be a signal-level or infrastructure issue. I’ve already:

Verified all coaxial and Ethernet connections
Updated router firmware
Monitored logs and confirmed no local faults

Could you please:

Review the line signal levels and error logs from your end
Confirm whether SYNC or RCS errors are present on the hub
Advise if an engineer visit is required to inspect the line or cabinet

I’d appreciate your support in resolving it promptly.

Modem logs:

Hub 3.0 device information
The information below shows current status of this Hub 3.0.

Standard specification compliant : DOCSIS 3.0
Hardware version : 10

Downstream bonded channels

Channel	Frequency (Hz)	Power (dBmV)	SNR (dB)	Modulation	Channel ID
1	139000000	0.7	37	256 qam	1
2	147000000	0.5	38	256 qam	2
3	155000000	-0.4	37	256 qam	3
4	163000000	0	37	256 qam	4
5	171000000	-0.4	37	256 qam	5
6	179000000	-0.2	37	256 qam	6
7	187000000	-0.4	37	256 qam	7
8	195000000	-1	37	256 qam	8
9	203000000	-0.2	38	256 qam	9
10	211000000	-0.5	38	256 qam	10
11	219000000	-0.2	36	256 qam	11
12	227000000	0.2	36	256 qam	12
13	235000000	-0.2	38	256 qam	13
14	243000000	-0.5	38	256 qam	14
15	347000000	1.9	38	256 qam	27
16	355000000	2	38	256 qam	28
17	363000000	1.7	38	256 qam	29
18	371000000	1.5	38	256 qam	30
19	379000000	1.7	38	256 qam	31
20	387000000	1.7	38	256 qam	32
21	395000000	1.2	38	256 qam	34
22	403000000	1.7	38	256 qam	35
23	411000000	1.2	38	256 qam	36
24	419000000	1.2	38	256 qam	37

Downstream bonded channels

Channel	Locked Status	RxMER (dB)	Pre RS Errors	Post RS Errors
1	Locked	37	37506135	813077
2	Locked	38.6	193431	36024
3	Locked	37.6	53283	2123
4	Locked	37.6	45627	1539
5	Locked	37.6	34557	1907
6	Locked	37.6	22829	1759
7	Locked	37.3	27275	803
8	Locked	37.6	18276	570
9	Locked	38.6	13821	428
10	Locked	38.6	15725	146
11	Locked	36.6	19200	171
12	Locked	36.6	19469	95
13	Locked	38.6	13178	62
14	Locked	38.9	10716	183
15	Locked	38.6	1711	74
16	Locked	38.6	1419	28
17	Locked	38.6	2184	28
18	Locked	38.9	1868	33
19	Locked	38.6	3943	42179
20	Locked	38.6	2769	993
21	Locked	38.6	2838	40
22	Locked	38.6	1801	27
23	Locked	38.6	3640	15572
24	Locked	38.6	1144	18