EC2 instance stopped unexpectedly in a multi account environment

Hi everyone,

I created an AWS organization and an OU Workload > Dev.
Under this one I created an account workload-dev to manage our dev environment.

But when I launch an instance ec2 with an AMI shared from my main account, the instance stopped unexpectedly each 10 or 20 minutes.
I also have two others instances with the same behavior.
Is there any reason for an instance to stop like that ?

The instance-id : i-03f90ec5aa056a4b9

I look at different parameters but everything seems okay. So I would like to find a solution.

Thanks for your help

Fred