Internet drops out almost every day
Hi, Since upgrading to the new GIG1 package, our broadband has been dropping offline randomly, mostly in the evenings. Sometimes it takes a good 10 minutes for it to come back online. This is becoming so often that we're becoming frustrated as a few of the important devices take some time to come back online. This imapcts WiFi and hardwired devices. The modem logs state the below when this happens: 28-08-2025 20:22:24 critical Unicast Maintenance Ranging attempted - No response - Retries exhausted;CM-MAC=MAC1:HERE;CMTS-MAC=0MAC:2HERE;CM-QOS=1.1;CM-VER=3.1; 28-08-2025 20:22:24 critical 16 consecutive T3 timeouts while trying to range on upstream channel 8;CM-MAC=MAC1:HERE;CMTS-MAC=0MAC:2HERE;CM-QOS=1.1;CM-VER=3.1; 28-08-2025 20:21:16 critical Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=MAC1:HERE;CMTS-MAC=0MAC:2HERE;CM-QOS=1.1;CM-VER=3.1; Looks like there's some issues with the maintenance attempts. Can someone please look into this and ask the relevant team to resolve this issue? Thanks,
Daily intermittent dropouts on VM Broadband
Hi All, I am having regular daily dropouts on my home network for all devices where they lose access to the internet for a few moments. Some devices then need re-setting up again to work with internet services regularly. Looking at my router status, I can see Pre-RS Errors but no Post-RS errors and a healthy SNR: Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors 1 Locked 40.3 188 0 2 Locked 38.9 48 0 3 Locked 40.3 138 0 4 Locked 40.3 42 0 5 Locked 40.3 33 0 6 Locked 40.3 98 0 7 Locked 40.3 62 0 8 Locked 40.3 199 0 9 Locked 40.3 47 0 10 Locked 40.3 85 0 11 Locked 40.3 94 0 12 Locked 40.9 432 0 13 Locked 40.3 75 0 14 Locked 40.9 95 0 15 Locked 40.9 192 0 16 Locked 40.9 71 0 17 Locked 40.3 314 0 18 Locked 40.3 197 0 19 Locked 40.3 170 0 20 Locked 40.9 307 0 21 Locked 40.3 149 0 22 Locked 40.3 104 0 23 Locked 40.3 161 0 24 Locked 40.3 150 0 Upstream however, I do see incrementing TS Timeouts (granted small numbers here): Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts 1 ATDMA 0 0 2 0 2 ATDMA 0 0 1 0 3 ATDMA 0 0 2 0 4 ATDMA 0 0 1 0 5 ATDMA 0 0 2 0 I do not see daily log errors for the issue but I do see some ranging response critical errors and some DHCP renewal errors: 31/12/2024 15:49:41 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; 31/12/2024 12:43:20 Error DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; 28/12/2024 23:51:26 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; 28/12/2024 00:43:20 Error DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; 24/12/2024 16:57:28 critical No Ranging Response received - T3 time-out;CM-MAC=**:**:**:**:**:**;CMTS-MAC=**:**:**:**:**:**;CM-QOS=1.1;CM-VER=3.0; I se a number of other forum posts that seem to be a similar issue which has varied responses, but some mentioned a requirement to replace the router: https://community.virginmedia.com/t5/Networking-and-WiFi/Errors-No-Ranging-Response-received-T3-time-out-and-separate-T4/td-p/5338859/page/3 Can someone please help me work through it as it's driving us mad every time we're in the middle of loading a show to watch or need to google something. Thanks, B
Connection bouncing intermittently, suspect DOCSIS 3.1 levels
Hi! Been a long time since I posted here! Been having an issue with my connection pretty much from when it was installed. It will intermittently start bouncing up and down - last night was particularly bad, with 26 interruptions in the space of an hour. Looking at the stats I think our DOCSIS 3.1 levels are out of spec and we have a fault - our PLC power is -15.5DBmV where I think the spec is like supposed to be -6 to +10DBmV. Full logs below! : Cable Modem StatusItem Status TypeChannel Overview Downstream Upstream Cable Modem Status Online DOCSIS 3.0 Primary downstream channel Locked SC-QAM DOCSIS 3.0 channels 31 5 DOCSIS 3.1 channels 1 1 3.0 Downstream channels Channel Frequency (Hz) Power (dBmV) SNR (dB) Modulation Channel ID 1 339000000 -6.5 39 QAM 256 26 2 139000000 0.3 40 QAM 256 1 3 147000000 0.2 40 QAM 256 2 4 155000000 0.5 40 QAM 256 3 5 163000000 0.9 40 QAM 256 4 6 171000000 -1.4 40 QAM 256 5 7 179000000 -1.9 40 QAM 256 6 8 187000000 -2.2 40 QAM 256 7 9 195000000 -2.2 40 QAM 256 8 10 203000000 -2.5 40 QAM 256 9 11 211000000 -2.8 40 QAM 256 10 12 219000000 -3.2 40 QAM 256 11 13 227000000 -3.9 40 QAM 256 12 14 235000000 -4 40 QAM 256 13 15 251000000 -4.6 40 QAM 256 15 16 259000000 -4.7 40 QAM 256 16 17 267000000 -4.8 40 QAM 256 17 18 275000000 -4.8 40 QAM 256 18 19 283000000 -4.9 40 QAM 256 19 20 291000000 -5.1 40 QAM 256 20 21 299000000 -5.3 40 QAM 256 21 22 307000000 -5.8 40 QAM 256 22 23 315000000 -5.9 40 QAM 256 23 24 323000000 -6.3 40 QAM 256 24 25 331000000 -6.4 40 QAM 256 25 26 347000000 -7 39 QAM 256 27 27 355000000 -6.9 40 QAM 256 28 28 363000000 -6.9 40 QAM 256 29 29 371000000 -7.3 39 QAM 256 30 30 379000000 -7.6 39 QAM 256 31 31 387000000 -8.3 39 QAM 256 32 3.0 Downstream channels Channel Locked Status RxMER (dB) Pre RS Errors Post RS Errors 1 Locked 39 88 0 2 Locked 40 35 0 3 Locked 40 36 0 4 Locked 40 33 0 5 Locked 40 19 0 6 Locked 40 63 0 7 Locked 40 112 0 8 Locked 40 41 0 9 Locked 40 30 0 10 Locked 40 36 0 11 Locked 40 26 0 12 Locked 40 23 0 13 Locked 40 28 0 14 Locked 40 37 0 15 Locked 40 30 0 16 Locked 40 46 0 17 Locked 40 69 0 18 Locked 40 73 0 19 Locked 40 65 0 20 Locked 40 34 0 21 Locked 40 28 0 22 Locked 40 53 0 23 Locked 40 59 0 24 Locked 40 72 0 25 Locked 40 73 0 26 Locked 39 111 0 27 Locked 40 102 0 28 Locked 40 104 0 29 Locked 39 177 0 30 Locked 39 223 0 31 Locked 39 398 0 3.1 Downstream channels Channel Channel Width (MHz) FFT Type Number of Active Subcarriers Modulation (Active Profile) First Active Subcarrier (Hz) 33 94 4K 1840 QAM 4096 1108 3.1 Downstream channels Channel ID Locked Status RxMER Data (dB) PLC Power (dBmV) Corrected errors (Active Profile) Uncorrectable errors (Active Profile) 33 Locked 35 -15.5 611240571 7827454 3.0 Upstream channels Channel Frequency (Hz) Power (dBmV) Symbol Rate (ksps) Modulation Channel ID 0 49600000 45.8 5120 QAM 64 1 1 43100000 45.8 5120 QAM 64 2 2 36600000 45.8 5120 QAM 64 3 3 30100000 45.8 5120 QAM 64 4 4 23600000 45.8 5120 QAM 64 5 3.0 Upstream channels Channel Channel Type T1 Timeouts T2 Timeouts T3 Timeouts T4 Timeouts 0 ATDMA 0 0 5 0 1 ATDMA 0 0 3 0 2 ATDMA 0 0 0 0 3 ATDMA 0 0 0 0 4 ATDMA 0 0 0 0 3.1 Upstream channels Channel Channel Width (MHz) Power (dBmV) FFT Type Modulation 6 10.4 41.2 2K QAM 256 3.1 Upstream channels Channel Channel Type Number of Active Subcarriers First Active Subcarrier (Hz) T3 Timeouts T4 Timeouts 6 OFDMA 208 74000000 0 0 General Configuration Network accessMaximum Number of CPEsBaseline PrivacyDOCSIS ModeConfig file Allowed 1 Enabled 3.1 cmreg-vmdg660-bbt076-b.cm Primary Downstream Service Flow SFIDMax Traffic RateMax Traffic BurstMin Traffic Rate 35890 1230000450 bps 42600bytes 0 bps Primary Upstream Service Flow SFIDMax Traffic RateMax Traffic BurstMin Traffic RateMax Concatenated BurstScheduling Type 35889 110000274 bps 42600bytes 0 bps 42600bytes Best EffortErrors and Timeouts
Just now, my internet started “buffering” on Netflix which it never does (I’m on the 1GB service, using a Hub 5) so thought I would check my logs and noticed lots of T3 errors and critical messages. Can someone pls explain what I need to do as I don’t understand it. I was getting T3 errors before and when I rebooted they all went away but slowly creep back in. I have a broadband monitor set up which I have attached as well as the logs. Please advise accordingly. Logs on messages below. Thanks all. https://www.thinkbroadband.com/broadband/monitoring/quality/share/88b2215f41ff6a289f376f4055dd348faeb56a02
