JVM & Tomcat stop automatically on all instances for web app

Why does it stop running?

I am also surprised. I have discussed with Linode support team, they don't have idea as it is installed by user. It is happening to not even single server/instance, happening to all instances/servers.

-Pradumna

I'd pick an instance, quiesce it, monitor and see if it shuts down with no load. Try to correlate what else is happening on the server at the moment the instance shuts down, check all logs. If you're using Tomcat from the repos; try turning it off temporarily, download the latest from Apache and run that without installing your apps; if that goes OK and it doesn't shut down then install your apps to its web apps directory and see if it runs past the former shutdown time. If that works, put that node in service for while and monitor.