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To aid the triage process you may follow relevant article ex. for EC2 Linux instance status check failure you can review steps in this guide: https://aws.amazon.com/premiumsupport/knowledge-center/ec2-linux-status-check-failure-os-errors/
If you still require support you should consider opening an AWS support case.
answered 3 years ago

Some details on what a failed instance status check means can be found here.
More details are needed, do you get any log output from either the system logs or image screenshot? Is this only happening with a particular AMI, Region, Availability Zone? Are you manipulating the network configuration in the instance's user data script?