Ubuntu server shutdown by itself

[OskOskOsk]

Hello why my Ubuntu server randomly shutdown?

(...)
Feb 23 21:17:01 server CRON[2970]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Feb 23 21:30:40 server NetworkManager[885]: <info>  [1614115840.9105] manager: sleep: sleep requested (sleeping: no  enabled: yes)
Feb 23 21:30:40 server NetworkManager[885]: <info>  [1614115840.9106] manager: NetworkManager state is now ASLEEP
Feb 23 21:30:40 server gnome-shell[1314]: Screen lock is locked down, not locking
Feb 23 21:30:40 server systemd[1]: Reached target Sleep.
Feb 23 21:30:40 server systemd[1]: Starting Suspend...
Feb 23 21:30:40 server systemd-sleep[2977]: Suspending system...
Feb 23 21:30:40 server kernel: [ 4826.457909] PM: suspend entry (deep)
Feb 23 21:30:40 server /usr/lib/gdm3/gdm-x-session[1263]: (**) Option "fd" "37"
Feb 23 21:30:40 server /usr/lib/gdm3/gdm-x-session[1263]: (II) event1  - Power Button: device removed
Feb 23 21:30:40 server /usr/lib/gdm3/gdm-x-session[1263]: (**) Option "fd" "38"
Feb 23 21:30:40 server /usr/lib/gdm3/gdm-x-session[1263]: (II) event0  - Power Button: device removed
Feb 23 21:33:37 server kernel: [ 4826.462086] Filesystems sync: 0.004 seconds
(...)

 

[Rob]

Is this a laptop?

 

[OskOskOsk]

Is this a laptop?

Its PC/Server

 

[Deleted member 108694]

does your server have an NVIDIA Card in it?

also what is the output of

cat /var/log/kern.log | grep shutting

If there is no output from the above it is not thermal/heat related