Why does my omv-Server reboot constantly ?

I have built a multimediaserver and added a service which should restart my server once every day. After i saved the settings, i´ve restarted the server and logged in to the webinterface but more or less 10 seconds later it restarted again. Now it restarts every 10 seconds after it had boot.

how do i make it stop ?

i just want the server to restart, because the data traffic is very high sometimes and i wanted to be safe.
i also think, that i have missconfigured it. how do i modify the cron job ?
in the cron file there are 7 shutdown -r jobs listed. are these those which rebooting my server ?

thank you for your help

i've found out how to do it and it isn't rebooting anymore but another error had ocurred. i think the server haven't got an ip adress, because i couldn't connect to the web interface and when i look to the device list in my router, the server isn't shown there. What else i should add is, that i have installed rcconf because i googled the issue and most sollutions of other problems like this were to disable the guilty service so i tryed out some of them but i'd activated them all back again.

found out that too,

thank you very much for your support

but i get following issues now:

1)
Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; hostname --fqdn 2>&1' with exit code '1': hostname: Name or service not known

2)
Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; systemctl start 'proftpd' 2>&1' with exit code '1': Job for proftpd.service failed because the control process exited with error code. See "systemctl status proftpd.service" and "journalctl -xe" for details.

3)
Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C; ftpwho -v 2>&1' with exit code '1': /run/proftpd.scoreboard: No such file or directory (Perhaps you need to specify the ScoreboardFile with -f, or change the compile-time default directory?)

... after i changed the ip address because it had changed