Random Reboot of Ubuntu 18.04.4 docker host server

Our server is provisioned last week (OVH server) and working fine for last week and we got a random reboot today(3 times). Pls find the details from below.

4.15.0-112-generic

The logs from syslog is:

Jul 27 01:05:17 nsXXXXXXX systemd-networkd[1147]: veth31c92c6: Link DOWN
Jul 27 01:05:17 nsXXXXXXX systemd-timesyncd[1039]: Network configuration changed, trying to establish connection.
Jul 27 01:05:17 nsXXXXXXX systemd-timesyncd[1039]: Synchronized to time server 213.251.18.34:123 (ntp.ovh.net).
Jul 27 01:05:17 nsXXXXXXX kernel: [102025.793774] docker0: port 1(veth31c92c6) entered disabled state
Jul 27 01:05:17 nsXXXXXXX kernel: [102025.794108] device veth31c92c6 left promiscuous mode
Jul 27 01:05:17 nsXXXXXXX kernel: [102025.794114] docker0: port 1(veth31c92c6) entered disabled state
Jul 27 01:05:18 nsXXXXXXX systemd-networkd[1147]: veth373563a: Link UP
Jul 27 01:05:18 nsXXXXXXX systemd-timesyncd[1039]: Network configuration changed, trying to establish connection.
Jul 27 01:05:18 nsXXXXXXX kernel: [102026.647724] docker0: port 1(veth373563a) entered blocking state
Jul 27 01:05:18 nsXXXXXXX kernel: [102026.647726] docker0: port 1(veth373563a) entered disabled state
Jul 27 01:05:18 nsXXXXXXX kernel: [102026.647791] device veth373563a entered promiscuous mode
Jul 27 01:05:18 nsXXXXXXX kernel: [102026.647863] IPv6: ADDRCONF(NETDEV_UP): veth373563a: link is not ready
Jul 27 01:05:18 nsXXXXXXX systemd-udevd[1919]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
Jul 27 01:05:18 nsXXXXXXX networkd-dispatcher[1376]: WARNING:Unknown index 6076 seen, reloading interface list
Jul 27 01:05:18 nsXXXXXXX systemd-udevd[1919]: Could not generate persistent MAC address for vethe75f52f: No such file or directory
Jul 27 01:05:18 nsXXXXXXX systemd-udevd[1920]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
Jul 27 01:05:18 nsXXXXXXX systemd-udevd[1920]: Could not generate persistent MAC address for veth373563a: No such file or directory
Jul 27 01:05:18 nsXXXXXXX systemd-timesyncd[1039]: Synchronized to time server 213.251.18.34:123 (ntp.ovh.net).
Jul 27 01:05:18 nsXXXXXXX systemd-timesyncd[1039]: Network configuration changed, trying to establish connection.
Jul 27 01:05:18 nsXXXXXXX systemd-timesyncd[1039]: Synchronized to time server 213.251.18.34:123 (ntp.ovh.net).
Jul 27 01:25:58 nsXXXXXXX systemd-modules-load[622]: Inserted module 'iscsi_tcp'
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] Linux version 4.15.0-112-generic (buildd@lcy01-amd64-027) (gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)) #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020 (Ubuntu 4.15.0-112.113-generic 4.15.18)
Jul 27 01:25:58 nsXXXXXXX systemd-modules-load[622]: Inserted module 'ib_iser'
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Started Load Kernel Modules.
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-4.15.0-112-generic root=/dev/md3 ro console=tty1 console=ttyS0 modprobe.blacklist=btrfs
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] KERNEL supported cpus:
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Started Set the console keyboard layout.
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000]   Intel GenuineIntel
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Mounted Huge Pages File System.
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000]   AMD AuthenticAMD
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000]   Centaur CentaurHauls
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Started Uncomplicated firewall.
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Started Create list of required static device nodes for the current kernel.
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'standard' format.
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Started Remount Root and Kernel File Systems.
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] e820: BIOS-provided physical RAM map:
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009abff] usable
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x000000000009ac00-0x000000000009ffff] reserved
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Mounted POSIX Message Queue File System.
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000007de58fff] usable
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x000000007de59000-0x000000007e006fff] reserved
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Mounted Kernel Debug File System.
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x000000007e007000-0x000000007e1ecfff] ACPI NVS
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Started LVM2 metadata daemon.
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x000000007e1ed000-0x000000007f366fff] reserved
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x000000007f367000-0x000000007f7fffff] ACPI NVS
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x0000000080000000-0x000000008fffffff] reserved
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed3ffff] reserved
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000087fffffff] usable
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] NX (Execute Disable) protection: active
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Starting Load/Save Random Seed...
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] SMBIOS 2.7 present.
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] DMI: Supermicro X9SRE/X9SRE-3F/X9SRi/X9SRi-3F/X9SRE/X9SRE-3F/X9SRi/X9SRi-3F, BIOS 3.3.V1 02/04/2020
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Starting Create Static Device Nodes in /dev...
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Mounting Kernel Configuration File System...
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] e820: last_pfn = 0x880000 max_arch_pfn = 0x400000000
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Mounting FUSE Control File System...
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] MTRR default type: uncachable
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Starting Apply Kernel Variables...
Jul 27 01:25:58 nsXXXXXXX systemd[1]: Starting Flush Journal to Persistent Storage...
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] MTRR fixed ranges enabled:
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000]   00000-9FFFF write-back
Jul 27 01:25:58 nsXXXXXXX systemd-sysctl[726]: Couldn't write '0' to 'net/ipv6/conf/eth0/autoconf', ignoring: No such file or directory
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000]   A0000-BFFFF uncachable
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000]   C0000-FFFFF write-protect
Jul 27 01:25:58 nsXXXXXXX systemd-sysctl[726]: Couldn't write '0' to 'net/ipv6/conf/eth0/accept_ra', ignoring: No such file or directory
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000] MTRR variable ranges enabled:
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000]   0 base 000000000000 mask 3FF800000000 write-back
Jul 27 01:25:58 nsXXXXXXX systemd-sysctl[726]: Couldn't write '0' to 'net/ipv6/conf/eth0/accept_ra_defrtr', ignoring: No such file or directory
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000]   1 base 000800000000 mask 3FFF80000000 write-back
Jul 27 01:25:58 nsXXXXXXX systemd-sysctl[726]: Couldn't write '0' to 'net/ipv6/conf/eth0/accept_ra_pinfo', ignoring: No such file or directory
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000]   2 base 000080000000 mask 3FFF80000000 uncachable
Jul 27 01:25:58 nsXXXXXXX kernel: [    0.000000]   3 disabled

The reboot happened at Jul 27 01:25:58 in the above log. Anyone faced similar problem? I could give you more informations