EC2 status check fail and connected fail

Question

I can't connect to my ec2 instance by ssh, and I notice its health check failed yesterday. At the same time, monitor can't get any data from instance. 
I try to get some info from "Actions -> Monitor and troubleshoot -> Get system log " but there is no latest log.
I try to restart my instance, error still exist and I still can't connect to my instance by ssh.
Plesae tell me what else could I do to fix my instance.

Answer

Hello @rePost-User-1957268

This issue occurs due to operating system-level errors such as the following:
Failure to boot the operating system
Failure to mount the volumes correctly
Exhausted CPU and memory
Kernel panic
Network failed to come up

Refer to the below resolution link:
if the instance status check or system status check failed by viewing the instance 
https://aws.amazon.com/premiumsupport/knowledge-center/ec2-linux-status-check-failure/

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EC2 status check fail and connected fail

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