Getting issue when i set cron using node-cron and pm2 but after 1 day my crons not working and also my droplets terminal getting slow issue

Hello Team, I am getting issue after following below mentioned tutorial for set node crons when i set cron and run my index.js file with node command it run properly and crons working fine but issue is as usual when i close the terminal cron is stops working so solution is to use pm2 i used pm2 and start my index.js file and its working fine but after 1 or 2 days my droplet getting slowness issue and not working well i need to restart that and after restart again its working fine for two days and then getting same issue. If anyone have solution for this please let me know i am struggling to finding the way to do this.

I used this tutorial to set my cron application https://www.digitalocean.com/community/tutorials/nodejs-cron-jobs-by-examples