Data lost Strapi Nodejs & Pg-SQL

I am using Strapi with Nodejs & I have two collections slider and coupons along with multiple collections right! and my back-end code deployed on EC-2 instance. The issue that I am facing is whenever I restart my EC-2 instance then start my back-end server my data getting lost mainly I noticed that active key set to null automatically in slider collection and customTitle from coupons collection. I don’ know why its happening