EC2 Status Check Fails

I have launched an EC2 instance of g4dn.2xlarge type using this AMI

It was working very well but the last time I tried to start the instance and connect with it using SSH, I only the following error:

ssh: connect to host ___ port 22: Connection timed out

Then I found that the status check fails with the instance reachability check failed error as shown in the following figure.

I tried to look up a solution to this problem and I found those two posts: https://repost.aws/knowledge-center/ec2-linux-system-status-check-failure https://repost.aws/knowledge-center/ec2-linux-status-check-failure

And I tried to stop and start the instance and reboot it as mentioned in the previous links and waited for a day and tried again but with no luck.

After that, I tried to look into the system log of the instance and found the following issues:

1. nvidia: module verification failed: signature and/or required key missing - tainting kernel
2. Failed to start apply_instance_tag_service AWS Helper Service. See 'systemctl status apply_instance_tag_service.service' for details. Unmounting RPC Pipe File System..

Is there any other way to fix this problem and be able to connect to the instance?