How to get the reason for macOS Catalina regular restart?

Question

I know, that my remote MacOS restarts daily at the same time (9:30AM).
Energy Saver contains only "Start up or wake" scheduled to 07:45AM.



I checked the logs for "Previous shutdown cause" by doing
log show --predicate 'eventMessage contains "Previous shutdown cause"' --last 24h
and got the answer
kernel: (AppleSMC) Previous shutdown cause: 3
what means
Code 3 is a "dirty" Shutdown, which can be caused by any user-initiated Reboot of the computer, or by forcing a hardware computer halt by holding down the power button for 5+ seconds.
I'm trying to figure out what was the real reason for the restart. What are the possible options here?

Answer 1

the reason was a following cronjob: 30 09 * * * sudo /sbin/shutdown -r now

find all cron jobs for user: crontab -l