My cronjob always got removed

I setup a cronjob running once every hour on my MCM gen 2, but it always got removed from the cronjob, automatically. I saw one entry in my cronjob : 0 3 * * * . However, I cannot locate that file, and I tried adding something to crontab then run, it didn’t flush out what I just added. How do you guys add entries to crontab? Thanks!

Hello there,

I have not used Cronjob to run commands, but there are some experienced users on this forum which can provide useful information about your situation.