Nextcloud

Okay i have a strange problem. Im running a nextcloud instance with linuxserver.io docker. And every night at 03:00 AM i get 100% load. And it disapears when i restart the docker.

I have entered docker shell when the high loads occurs and i see that the process is php /app/www/public/cron.php that is causing the high load.

Nothing i the logs shows errors and i have checked all settings. How can i continue the search of what making the high load?

I cant trigger the high load from anything else execpt waiting until 03:00 AM.