the scrapper is stopping after scrapping few chapters

Hi, so I have increased my server Max execution time to 99999 and still after scrapping few chapters somewhere in between 15,20 chapters of the manga it stops and I dont know why it is stopping because I dont see any error in the logs, it just stops and it runs again when its scheduled and then again it will do the same and gets stop. is it made like this like it will stop scraping after every few chapters ?