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There might be a lot of reasons for health check to fail, like CPU, memory, disk, network, kernel, etc. So, have you already confirmed that the memory is the issue here?
If not, check these below documentations and troubleshoot accordingly.
[+] https://repost.aws/knowledge-center/ec2-linux-status-check-failure
[+] https://repost.aws/knowledge-center/ec2-linux-status-check-failure-os-errors
I also recommend setting up atop and sar on the instance to monitor the resource utilization at OS level. You can later use this to investigate if there were any spikes in resource utilization during the time of incident.
[+] https://repost.aws/knowledge-center/ec2-linux-configure-monitoring-tools
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