Proxmox stuck after VM backup

[Loops Creative]

I don't know why this morning i can't access to my proxmox...and i do manually reboot and it happened last month too..

pve version :
pve-manager/8.1.10/4b06efb5db453f29 (running kernel: 6.5.13-3-pve)

backup mounted smb/cifs from synology nas on pve storage /mnt/pve/backup, shared and enable.

VM backup run by batch of 4 @ 3:37 and 4:37, so the log you see below is that of second batch.

Here you can view last log before crash, backup finish with VM129 and begin with VM130 and just after deactivate successful, pouff, storage 'backup' is not online..

May 08 04:38:14 lps-srv-02 pvescheduler[2524342]: INFO: Finished Backup of VM 129 (00:01:10)
May 08 04:38:14 lps-srv-02 pvescheduler[2524342]: INFO: Starting Backup of VM 130 (lxc)
May 08 04:38:14 lps-srv-02 kernel: docker0: port 1(veth931bb60) entered disabled state
May 08 04:38:14 lps-srv-02 kernel: vethccd2192: renamed from eth0
May 08 04:38:14 lps-srv-02 kernel: docker0: port 1(veth931bb60) entered disabled state
May 08 04:38:14 lps-srv-02 kernel: veth931bb60 (unregistering): left allmulticast mode
May 08 04:38:14 lps-srv-02 kernel: veth931bb60 (unregistering): left promiscuous mode
May 08 04:38:14 lps-srv-02 kernel: docker0: port 1(veth931bb60) entered disabled state
May 08 04:38:15 lps-srv-02 kernel: vmbr0: port 19(veth130i0) entered disabled state
May 08 04:38:15 lps-srv-02 kernel: vmbr0: port 19(veth130i0) entered disabled state
May 08 04:38:15 lps-srv-02 kernel: veth130i0 (unregistering): left allmulticast mode
May 08 04:38:15 lps-srv-02 kernel: veth130i0 (unregistering): left promiscuous mode
May 08 04:38:15 lps-srv-02 kernel: vmbr0: port 19(veth130i0) entered disabled state
May 08 04:38:15 lps-srv-02 audit[2526123]: AVC apparmor="STATUS" operation="profile_remove" profile="/usr/bin/lxc-start" name="lxc-130_</var/lib/lxc>" pid=2526123 comm="apparmor_parser"
May 08 04:38:15 lps-srv-02 kernel: audit: type=1400 audit(1715135895.560:97): apparmor="STATUS" operation="profile_remove" profile="/usr/bin/lxc-start" name="lxc-130_</var/lib/lxc>" pid=2526123 comm="apparmor_parser"
May 08 04:38:16 lps-srv-02 systemd[1]: pve-container@130.service: Deactivated successfully.
May 08 04:39:04 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:39:04 lps-srv-02 pvestatd[2866]: status update time (10.612 seconds)
May 08 04:39:11 lps-srv-02 kernel: CIFS: VFS: \\lps-srv-03 sends on sock 00000000b4e7681c stuck for 15 seconds
May 08 04:39:11 lps-srv-02 kernel: CIFS: VFS: \\lps-srv-03 Error -11 sending data on socket to server
May 08 04:39:15 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:39:15 lps-srv-02 pvestatd[2866]: status update time (10.613 seconds)
May 08 04:39:25 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:39:25 lps-srv-02 pvestatd[2866]: status update time (10.580 seconds)
May 08 04:39:26 lps-srv-02 kernel: CIFS: VFS: \\lps-srv-03 sends on sock 00000000b4e7681c stuck for 15 seconds
May 08 04:39:26 lps-srv-02 kernel: CIFS: VFS: \\lps-srv-03 Error -11 sending data on socket to server
May 08 04:39:36 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:39:36 lps-srv-02 pvestatd[2866]: status update time (10.579 seconds)
May 08 04:39:46 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:39:47 lps-srv-02 pvestatd[2866]: status update time (10.554 seconds)
May 08 04:39:57 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:39:57 lps-srv-02 pvestatd[2866]: status update time (10.564 seconds)
May 08 04:40:08 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:40:08 lps-srv-02 pvestatd[2866]: status update time (10.587 seconds)
May 08 04:40:18 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:40:18 lps-srv-02 pvestatd[2866]: status update time (10.581 seconds)
May 08 04:40:29 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:40:29 lps-srv-02 smartd[2393]: Device: /dev/sdd [SAT], SMART Usage Attribute: 190 Airflow_Temperature_Cel changed from 73 to 72
May 08 04:40:29 lps-srv-02 pvestatd[2866]: status update time (10.600 seconds)
May 08 04:40:39 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:40:39 lps-srv-02 pvestatd[2866]: status update time (10.570 seconds)
May 08 04:40:50 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:40:50 lps-srv-02 pvestatd[2866]: status update time (10.579 seconds)
May 08 04:41:00 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:41:01 lps-srv-02 pvestatd[2866]: status update time (10.613 seconds)
May 08 04:41:11 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:41:11 lps-srv-02 pvestatd[2866]: status update time (10.560 seconds)
May 08 04:41:22 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:41:22 lps-srv-02 pvestatd[2866]: status update time (10.594 seconds)
May 08 04:41:32 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:41:32 lps-srv-02 pvestatd[2866]: status update time (10.594 seconds)
May 08 04:41:43 lps-srv-02 pvestatd[2866]: storage 'backup' is not online
May 08 04:41:43 lps-srv-02 pvestatd[2866]: status update time (10.589 seconds)

Have you an idea ?

regards