EC2 instance availability issue

Question

I'm getting EC2 unavailable notifications from aws with the following notification: 
"Between Sun, 6 Aug 2023 06:44:09 GMT and Sun, 6 Aug 2023 07:12:07 GMT, a small number of EC2 instances were unavailable in the ap-southeast-1 region. Your affected EC2 instance(s) are listed in the “Affected resources” Tab. The issue has been resolved and the service is operating normally".
 I'd like to know why this is happening and already how to circumvent this error.

Accepted Answer

Hello.  
You may receive such notifications when retirements, maintenance, or failures occur on the physical hosts used by EC2.  
Basically, if automatic recovery is enabled as a response to a failure on a physical host, the EC2 will recover automatically.  
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-recover.html

However, in the event of an availability zone-level failure, it will be necessary to take action such as restoring the EC2 to a different subnet.

EC2 instance availability issue

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