My Linode is suddenly stopped, Let me know the reason?

Is your Linode located in Singapore? I ask because there's currently an incident posted to our status page regarding connectivity to that data center. We will post updates there as we learn more and work to resolve the issue.

https://status.linode.com/incidents/010fv77n2dm7

Otherwise, you'll need to provide more context into what you're seeing or troubleshooting steps that you've taken so far. That will allow others to know what the problem might be.