Connection time-outs every now and then

Question

Hello,My connection is getting annoying time-outs. For several years my connection was stable, but since 4-6 weeks the connection cuts off for 5-60 seconds every 5-90 minutes. Quite random, as you can see.Hub 3I did all sorts of reboots, resets, cable checks, modem placements and anything I can think of.Happens on all devices at the same time.&nbsp;It goes on like that. The graph doesn't really paint the full picture. I don't notice the yellow spikes, but the red spikes should be 100%.This here is more accurate. Fine most of the time, but then random time-out.&nbsp;Power levels: ~+2 to +3.5 dBmV across all channels. Fine.SNR / MER: ~38–41 dB. Also fine.Post-RS errors are non-zero and fairly high on all channels. Not fine.The network log has it's fair share of Timing Synchronization failure and RCS Partial Service.Sounds like a bad splitter (I don't have one), bad cabling or a return-path issue only Virgin can fix.The outside of the house looks like this, openly at the street (quality work):Any drunk vandal could just pull on them. Then again the cables have looked like this for years.What do?

Adduxi · Answer

Far too many PostRS errors, this needs sorted, most likely noise somewhere.&nbsp; Also the US power is too high.&nbsp; Not surprising really, considering the state of the outside cabling...

original_crispy · Answer

Downstream bonded channelsChannelFrequency (Hz)Power (dBmV)SNR (dB)ModulationChannel ID11550000002.238256 qam321390000002.538256 qam131470000002.438256 qam241630000002.538256 qam451710000002.538256 qam561790000002.938256 qam67187000000338256 qam78195000000338256 qam89203000000338256 qam910211000000338256 qam10112190000003.240256 qam1112291000000238256 qam20132990000001.738256 qam2114307000000238256 qam22153150000002.740256 qam2316323000000340256 qam24173310000003.240256 qam25183390000003.240256 qam2619347000000340256 qam27203550000003.240256 qam28213630000002.940256 qam29223710000002.740256 qam30233790000002.738256 qam31243870000002.540256 qam32Downstream bonded channelsChannelLocked StatusRxMER (dB)Pre RS ErrorsPost RS Errors1Locked38.94722121152Locked38.63176140433Locked38.65053183094Locked38.94735118565Locked38.93260104826Locked38.9267989117Locked38.62227104398Locked38.9185095789Locked38.91759896010Locked38.91101808411Locked40.9982900612Locked38.9939584213Locked38.9897450814Locked38.9977487315Locked40.3899471216Locked40.3922625417Locked40.3869420918Locked40.3922478219Locked40.3863379220Locked40.9902440321Locked40.3821455722Locked40.3840580823Locked38.9819400624Locked40.315154567&nbsp;Upstream bonded channelsChannelFrequency (Hz)Power (dBmV)Symbol Rate (ksps)ModulationChannel ID14960000052.5512064 qam123010000051512064 qam4Upstream bonded channelsChannelChannel TypeT1 TimeoutsT2 TimeoutsT3 TimeoutsT4 Timeouts1ATDMA00202ATDMA0000Network LogTimePriorityDescription06/01/2026 13:25:21noticeLAN login Success;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 13:15:38Warning!RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 13:15:38criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 13:11:54Warning!RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 13:11:54criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 13:06:26Warning!RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:59:38criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:47:12Warning!RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:30:44noticeLAN login Success;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:23:57Warning!RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:23:6criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:23:6Warning!RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:17:30criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:10:9Warning!RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:10:9criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:06:36Warning!RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:06:36criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:03:46Warning!RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 12:03:46criticalSYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;06/01/2026 11:56:14Warning!RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;

original_crispy · Answer

So basically my modem is yelling at max power (52 is pretty much the maximum the spec can deliver), try to fight the noise and the bad connection?

Client62 · Answer

The many Downstream Post RS errors are a concern.

Also there are only 2 Upstream Channels connected, we expect to see between 4 and 6.

Have you checked to see if there is a known noise fault in your street ?

Try both methods:

Call the local fault line: 0800 561 0061 – this is an automated number.

https://www.virginmedia.com/help/check/status/identification/identify

original_crispy · Answer

Have you checked to see if there is a known noise fault in your street ?

My connection has issues for 4-6 weeks now, so I'm gonna say there's no temporary fault in the area.

But of course I checked for area faults and there are none.

Forum Discussion

Connection time-outs every now and then

5 Replies

Downstream bonded channels

Downstream bonded channels

Upstream bonded channels

Upstream bonded channels

Network Log

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Channel	Frequency (Hz)	Power (dBmV)	SNR (dB)	Modulation	Channel ID
1	155000000	2.2	38	256 qam	3
2	139000000	2.5	38	256 qam	1
3	147000000	2.4	38	256 qam	2
4	163000000	2.5	38	256 qam	4
5	171000000	2.5	38	256 qam	5
6	179000000	2.9	38	256 qam	6
7	187000000	3	38	256 qam	7
8	195000000	3	38	256 qam	8
9	203000000	3	38	256 qam	9
10	211000000	3	38	256 qam	10
11	219000000	3.2	40	256 qam	11
12	291000000	2	38	256 qam	20
13	299000000	1.7	38	256 qam	21
14	307000000	2	38	256 qam	22
15	315000000	2.7	40	256 qam	23
16	323000000	3	40	256 qam	24
17	331000000	3.2	40	256 qam	25
18	339000000	3.2	40	256 qam	26
19	347000000	3	40	256 qam	27
20	355000000	3.2	40	256 qam	28
21	363000000	2.9	40	256 qam	29
22	371000000	2.7	40	256 qam	30
23	379000000	2.7	38	256 qam	31
24	387000000	2.5	40	256 qam	32

Channel	Locked Status	RxMER (dB)	Pre RS Errors	Post RS Errors
1	Locked	38.9	4722	12115
2	Locked	38.6	3176	14043
3	Locked	38.6	5053	18309
4	Locked	38.9	4735	11856
5	Locked	38.9	3260	10482
6	Locked	38.9	2679	8911
7	Locked	38.6	2227	10439
8	Locked	38.9	1850	9578
9	Locked	38.9	1759	8960
10	Locked	38.9	1101	8084
11	Locked	40.9	982	9006
12	Locked	38.9	939	5842
13	Locked	38.9	897	4508
14	Locked	38.9	977	4873
15	Locked	40.3	899	4712
16	Locked	40.3	922	6254
17	Locked	40.3	869	4209
18	Locked	40.3	922	4782
19	Locked	40.3	863	3792
20	Locked	40.9	902	4403
21	Locked	40.3	821	4557
22	Locked	40.3	840	5808
23	Locked	38.9	819	4006
24	Locked	40.3	1515	4567

Time	Priority	Description
06/01/2026 13:25:21	notice	LAN login Success;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 13:15:38	Warning!	RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 13:15:38	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 13:11:54	Warning!	RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 13:11:54	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 13:06:26	Warning!	RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:59:38	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:47:12	Warning!	RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:30:44	notice	LAN login Success;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:23:57	Warning!	RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:23:6	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:23:6	Warning!	RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:17:30	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:10:9	Warning!	RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:10:9	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:06:36	Warning!	RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:06:36	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:03:46	Warning!	RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 12:03:46	critical	SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;
06/01/2026 11:56:14	Warning!	RCS Partial Service;CM-MAC=ac:f8:cc:85:66:6c;CMTS-MAC=00:01:5c:73:c6:68;CM-QOS=1.1;CM-VER=3.0;

Channel	Channel Type	T1 Timeouts	T2 Timeouts	T3 Timeouts	T4 Timeouts
1	ATDMA	0	0	2	0
2	ATDMA	0	0	0	0