I can't connect to my EC2 instance.

I checked the connection after creating the instance, But it seems that at some point something went wrong with the instance.

After restarting the instance, It works fine, but I don't know the cause of the problem.

[Problems]

• Cannot connect using PuTTY
• 'ping' to Elastic IP is not responding
• The state of the instance is RUNNING, but failed to check the status of the instance

[Installed on EC2]

• Docker
• Apache + PHP (Container)
• MySQL (Container)

The CPU usage increased on 04/30/2022 03:00, and the instance status check fails after that. And there was no traffic at this time.

I checked the logs, no errors are found.

What more should I check?