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A65Rocket's avatar
A65Rocket
Joining in
8 days ago

SYNC Timing Synchronization failure - Loss of Sync - Virgin tech support please contact me.

Hello, I have been having my internet freeze / drop out intermittently for the past several year with this issue and this forum appears to be the only way of getting any technical support.

Let me start with my issue and what I have tried. So my modem randomly looses Internet connection there is no pattern to it it can happen 8 times a day or not at all for a week but it does not come back until I restart modem.

I have been In touch with support several times  and they have send me a new router and changed all my old 'copper' connections to new ones. (this was last week) after many attempts  by their 'chat' support to just reboot the router).

As I work from home, any small drop in connection results in my work VPN dropping which is a large inconvenience. When I'm in Teams calls, it regularly drops off for about 20 seconds before re-connection.

Please can someone from Virgin Tech support make contact with me and get this problem resolved.

Critical: SYNC Timing Synchronization failure - Loss of Sync;[removed];CM-QOS=1.1;CM-VER=3.0;

Warning: RCS Partial Service; [removed] ;CM-QOS=1.1;CM-VER=3.0;

[MOD EDIT: MAC addresses removed]

4 Replies

  • Downstream bonded channels
    Channel    Frequency (Hz)    Power (dBmV)    SNR (dB)    Modulation    Channel ID
    1    690250000    4.9    38    256 qam    40
    2    362250000    6.4    38    256 qam    1
    3    370250000    6.3    38    256 qam    2
    4    378250000    6    38    256 qam    3
    5    386250000    5.9    38    256 qam    4
    6    394250000    6    38    256 qam    5
    7    402250000    5.6    38    256 qam    6
    8    410250000    5.9    38    256 qam    7
    9    418250000    5.6    38    256 qam    8
    10    426250000    5.5    38    256 qam    9
    11    434250000    5.4    38    256 qam    10
    12    442250000    5.4    38    256 qam    11
    13    450250000    5.3    38    256 qam    12
    14    458250000    5    38    256 qam    13
    15    466250000    5.1    38    256 qam    14
    16    474250000    5    38    256 qam    15
    17    482250000    5.3    38    256 qam    16
    18    490250000    5    38    256 qam    17
    19    498250000    5.1    38    256 qam    18
    20    506250000    5    38    256 qam    19
    21    514250000    4.9    38    256 qam    20
    22    522250000    4.9    38    256 qam    21
    23    674250000    4.9    38    256 qam    38
    24    682250000    4.6    38    256 qam    39


    Downstream bonded channels
    Channel    Locked Status    RxMER (dB)    Pre RS Errors    Post RS Errors
    1    Locked    38.6    23199    47401
    2    Locked    38.9    6735    0
    3    Locked    38.6    6042    0
    4    Locked    38.6    7450    0
    5    Locked    38.9    4953    0
    6    Locked    38.6    4343    0
    7    Locked    38.6    4358    0
    8    Locked    38.9    3856    0
    9    Locked    38.9    3761    0
    10    Locked    38.6    5728    0
    11    Locked    38.9    6345    0
    12    Locked    38.9    6858    0
    13    Locked    38.6    11476    13
    14    Locked    38.9    22609    562
    15    Locked    38.6    43232    2792
    16    Locked    38.6    65548    6814
    17    Locked    38.9    87358    13003
    18    Locked    38.6    103053    26355
    19    Locked    38.6    115393    43499
    20    Locked    38.6    125820    73893
    21    Locked    38.9    112521    182785
    22    Locked    38.9    93196    306628
    23    Locked    38.6    22852    44715
    24    Locked    38.6    23273    47236

     

    Upstream bonded channels
    Channel    Frequency (Hz)    Power (dBmV)    Symbol Rate (ksps)    Modulation    Channel ID
    1    23600053    45.3    5120    64 qam    11
    2    36600000    45.3    5120    64 qam    7
    3    30100009    45.3    5120    64 qam    8
    4    43100000    45.3    5120    64 qam    6
    5    49600000    45.5    5120    64 qam    5


    Upstream bonded channels
    Channel    Channel Type    T1 Timeouts    T2 Timeouts    T3 Timeouts    T4 Timeouts
    1    ATDMA    0    0    1    0
    2    ATDMA    0    0    1    0
    3    ATDMA    0    0    2    0
    4    ATDMA    0    0    0    0
    5    ATDMA    0    0    1    0


    Network Log
    Time    Priority    Description
    18/06/2025 10:26:0    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    18/06/2025 02:25:44    Error    DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:11:31    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:06:18    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:04:37    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:04:37    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:01:13    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:50    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:44    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:42    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:42    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:34    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:12    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:0    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:59:48    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:59:19    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:58:22    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:58:21    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:57:18    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:57:11    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;

     

  • Downstream bonded channels
    Channel    Frequency (Hz)    Power (dBmV)    SNR (dB)    Modulation    Channel ID
    1    690250000    4.9    38    256 qam    40
    2    362250000    6.4    38    256 qam    1
    3    370250000    6.3    38    256 qam    2
    4    378250000    6    38    256 qam    3
    5    386250000    5.9    38    256 qam    4
    6    394250000    6    38    256 qam    5
    7    402250000    5.6    38    256 qam    6
    8    410250000    5.9    38    256 qam    7
    9    418250000    5.6    38    256 qam    8
    10    426250000    5.5    38    256 qam    9
    11    434250000    5.4    38    256 qam    10
    12    442250000    5.4    38    256 qam    11
    13    450250000    5.3    38    256 qam    12
    14    458250000    5    38    256 qam    13
    15    466250000    5.1    38    256 qam    14
    16    474250000    5    38    256 qam    15
    17    482250000    5.3    38    256 qam    16
    18    490250000    5    38    256 qam    17
    19    498250000    5.1    38    256 qam    18
    20    506250000    5    38    256 qam    19
    21    514250000    4.9    38    256 qam    20
    22    522250000    4.9    38    256 qam    21
    23    674250000    4.9    38    256 qam    38
    24    682250000    4.6    38    256 qam    39


    Downstream bonded channels
    Channel    Locked Status    RxMER (dB)    Pre RS Errors    Post RS Errors
    1    Locked    38.6    23199    47401
    2    Locked    38.9    6735    0
    3    Locked    38.6    6042    0
    4    Locked    38.6    7450    0
    5    Locked    38.9    4953    0
    6    Locked    38.6    4343    0
    7    Locked    38.6    4358    0
    8    Locked    38.9    3856    0
    9    Locked    38.9    3761    0
    10    Locked    38.6    5728    0
    11    Locked    38.9    6345    0
    12    Locked    38.9    6858    0
    13    Locked    38.6    11476    13
    14    Locked    38.9    22609    562
    15    Locked    38.6    43232    2792
    16    Locked    38.6    65548    6814
    17    Locked    38.9    87358    13003
    18    Locked    38.6    103053    26355
    19    Locked    38.6    115393    43499
    20    Locked    38.6    125820    73893
    21    Locked    38.9    112521    182785
    22    Locked    38.9    93196    306628
    23    Locked    38.6    22852    44715
    24    Locked    38.6    23273    47236

     

    Upstream bonded channels
    Channel    Frequency (Hz)    Power (dBmV)    Symbol Rate (ksps)    Modulation    Channel ID
    1    23600053    45.3    5120    64 qam    11
    2    36600000    45.3    5120    64 qam    7
    3    30100009    45.3    5120    64 qam    8
    4    43100000    45.3    5120    64 qam    6
    5    49600000    45.5    5120    64 qam    5


    Upstream bonded channels
    Channel    Channel Type    T1 Timeouts    T2 Timeouts    T3 Timeouts    T4 Timeouts
    1    ATDMA    0    0    1    0
    2    ATDMA    0    0    1    0
    3    ATDMA    0    0    2    0
    4    ATDMA    0    0    0    0
    5    ATDMA    0    0    1    0


    Network Log
    Time    Priority    Description
    18/06/2025 10:26:0    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    18/06/2025 02:25:44    Error    DHCP RENEW WARNING - Field invalid in response v4 option;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:11:31    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:06:18    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:04:37    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:04:37    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:01:13    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:50    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:44    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:42    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:42    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:34    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:12    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 19:00:0    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:59:48    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:59:19    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:58:22    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:58:21    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:57:18    Warning!    RCS Partial Service;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;
    17/06/2025 18:57:11    critical    SYNC Timing Synchronization failure - Loss of Sync;CM-MAC=*****************;CMTS-MAC=*****************;CM-QOS=1.1;CM-VER=3.0;

    • Kath_P's avatar
      Kath_P
      Icon for Forum Team rankForum Team

      Hi A65Rocket, 

      Thanks for taking the time to contact us via the Community. It's lovely having you on board with us in the Forums. ⭐

      We're sorry to hear you are having issues with your broadband connection. 😔 Our diagnostics on your home network and Hub have not found any issues that could account for the issues you've mentioned. We've run a check on the overall area and there are no open faults which could be affecting you either. 

      Looking at the devices you have connected to the hub, from the type and manufacturer of device reported as connected, it would suggest you're using a third party mesh system. Can you confirm if this is the case? 

      If so, we'd need to remove this and check the connection when only using VM equipment. Pop back here once it's removed so we can help further.

      Many thanks, 

  • Adduxi's avatar
    Adduxi
    Very Insightful Person

    Downstream channel 1 and 14 to 24 are showing signs of "noise" on the circuit, as noted by the PostRS errors.  Also the T3 timeouts on the Upstream are a possible problem.  I would suggest you check all the connections from the outside Omnibox to the Hub are secure and clean.  If these errors increase a technician will be required to find the ingress and fix it.