Looking at the DAQ VIM plots (plot1, plot2)  of the 2026-07-22, one can see that

• starting from the  2026-07-22-11h the latency of the TolmFrameBuiders (*_Fb) started to increase  
• while that of their frame receiver (FbmFFE) remains at the same level (~0.4s max) 
• This lead that there is an issue with the rtpc's ntpd daemon.

Looking at their /var/log/messages with the date in local time , one can found that there is an issue related to the chronyd daemons . 

 Below the report  related to the chronyd issue for some rtpcs 

• rtpc4 (SUSP_Fb)
  • Jul 22 14:37:38 rtpc4 chronyd[1442]: Can't synchronise: no selectable sources
    Jul 22 15:11:57 rtpc4 chronyd[1442]: Selected source 90.147.138.152
    Jul 22 15:17:21 rtpc4 chronyd[1442]: Can't synchronise: no selectable sources
    Jul 23 20:53:24 rtpc4 chronyd[1442]: Selected source 90.147.138.152
    Jul 23 20:53:24 rtpc4 chronyd[1442]: System clock wrong by -7.984378 seconds, adjustment started
    Jul 23 21:23:37 rtpc4 chronyd[1442]: Can't synchronise: no selectable sources
    Jul 23 21:37:39 rtpc4 chronyd[1442]: Selected source 90.147.138.152
    Jul 23 21:37:39 rtpc4 chronyd[1442]: System clock wrong by 4.052407 seconds, adjustment started
• rtpc7 ( FDS_Img; FDS_Fb)
  • Jul 22 13:53:42 rtpc7 chronyd[1453]: Can't synchronise: no selectable sources
    Jul 23 23:59:02 rtpc7 chronyd[1453]: Selected source 90.147.138.152
    Jul 23 23:59:02 rtpc7 chronyd[1453]: System clock wrong by -7.775702 seconds, adjustment started
• rtpc8 (SNEB_Fb)
  • Jul 22 14:32:56 rtpc8 chronyd[1451]: Can't synchronise: no selectable sources
    Jul 22 15:41:46 rtpc8 chronyd[1451]: Selected source 90.147.138.152
    Jul 22 15:47:10 rtpc8 chronyd[1451]: Can't synchronise: no selectable sources
• rtpc9 (SWEB_Fb)
  • Jul 22 14:44:16 rtpc9 chronyd[1451]: Can't synchronise: no selectable sources
    Jul 22 19:02:14 rtpc9 chronyd[1451]: Selected source 90.147.138.152
    Jul 22 19:02:14 rtpc9 chronyd[1451]: System clock wrong by 1.607974 seconds, adjustment started
    Jul 22 19:07:36 rtpc9 chronyd[1451]: Can't synchronise: no selectable sources
    Jul 23 20:53:30 rtpc9 chronyd[1451]: Selected source 90.147.138.152
    Jul 23 20:53:30 rtpc9 chronyd[1451]: System clock wrong by -8.208126 seconds, adjustment started
    Jul 23 21:23:45 rtpc9 chronyd[1451]: Can't synchronise: no selectable sources
    Jul 23 21:37:47 rtpc9 chronyd[1451]: Selected source 90.147.138.152
    Jul 23 21:37:47 rtpc9 chronyd[1451]: System clock wrong by 3.713912 seconds, adjustment started
• rtpc21 (SSFS_Fb) :

  • Jul 22 14:42:31 rtpc21 chronyd[1943]: Can't synchronise: no selectable sources
    Jul 22 14:59:38 rtpc21 chronyd[1943]: Selected source 90.147.138.152
    Jul 22 15:05:02 rtpc21 chronyd[1943]: Can't synchronise: no selectable sources
    Jul 23 23:58:50 rtpc21 chronyd[1943]: Selected source 90.147.138.152
    Jul 23 23:58:50 rtpc21 chronyd[1943]: System clock wrong by -7.652092 seconds, adjustment started

This should be fixed by the IT department