Mes soupçons se confirment ?..
root@pc16:/var/log# tail daemon.log
Feb 19 13:27:23 pc16 NetworkManager[463]: Activation (wlan0) successful, device activated.
Feb 19 13:27:23 pc16 nm-dispatcher: Dispatching action ‘up’ for wlan0
Feb 19 13:27:23 pc16 ntpdate[17035]: the NTP socket is in use, exiting
Feb 19 13:27:24 pc16 avahi-daemon[459]: Joining mDNS multicast group on interface wlan0.IPv6 with address fe80::218:deff:feaa:9d3c.
Feb 19 13:27:24 pc16 avahi-daemon[459]: New relevant interface wlan0.IPv6 for mDNS.
Feb 19 13:27:24 pc16 avahi-daemon[459]: Registering new address record for fe80::218:deff:feaa:9d3c on wlan0.*.
Feb 19 13:27:25 pc16 ntpd[546]: Listen normally on 23 wlan0 192.168.1.19 UDP 123
Feb 19 13:27:25 pc16 ntpd[546]: Listen normally on 24 wlan0 fe80::218:deff:feaa:9d3c UDP 123
Feb 19 13:27:25 pc16 ntpd[546]: peers refreshed
Feb 19 13:27:30 pc16 NetworkManager[463]: wpa_supplicant die count reset
root@pc16:/var/log# tail daemon.log.1
Feb 19 03:40:26 pc16 ntpd[546]: Listen normally on 20 wlan0 fe80::218:deff:feaa:9d3c UDP 123
Feb 19 03:40:26 pc16 ntpd[546]: peers refreshed
Feb 19 03:40:30 pc16 ntpdate[4780]: the NTP socket is in use, exiting
Feb 19 03:40:30 pc16 NetworkManager[463]: wpa_supplicant die count reset
Feb 19 04:12:47 pc16 wpa_supplicant[4702]: wlan0: WPA: Group rekeying completed with 30:7c:b2:17:f5:03 [GTK=TKIP]
Feb 19 05:12:47 pc16 wpa_supplicant[4702]: wlan0: WPA: Group rekeying completed with 30:7c:b2:17:f5:03 [GTK=TKIP]
Feb 19 06:12:47 pc16 wpa_supplicant[4702]: wlan0: WPA: Group rekeying completed with 30:7c:b2:17:f5:03 [GTK=TKIP]
Feb 19 07:12:47 pc16 wpa_supplicant[4702]: wlan0: WPA: Group rekeying completed with 30:7c:b2:17:f5:03 [GTK=TKIP]
Feb 19 07:30:02 pc16 systemd[1]: Starting Run anacron jobs…
Feb 19 07:30:02 pc16 systemd[1]: Started Run anacron jobs.