Preloading stops by itself

Hi, i have had this since i installed Super Cache plugin. When i start preloading, sometimes i go back to the preload tab and it just is stopped. I´m using cron schedule from my cPanel. While it works, thw website runs perfect. But many times i enter to my WordPress dashboard and i find out that it´s stopped and the cache cleared.

My website: https://lamañanalider.com
Theme: Pennews