I have a RUT950 that reboots ever night at 23:00.
In the log it states that the reboot scheduler requested a reboot but the scheduler is not actually configured.
I tried adding and removing a reboot schedule for 23:00 but this did not solve the issue.
Please… Try the CLI… go to /etc/crontab
Check all files there…
cd /etc/crontab
ls -l ; to see all files there
cat name_of_file ; to see all setting of the archive…