GitLab 12.8.6 not working after restart, Service is not accessible

Hello GitLab Support team,
We are using GitLab of Version 12.8.6 hosted on AWS EC2 instance.
The issue we are facing is once we restart the EC2 server, after 2-5 minutes the GitLab goes down
We have checked the GitLab status in the server it is running fine but we are not able to access it.
Please share your solutions for this problem
We are waiting for your reply
Thanks in advance…