There could be any number of reasons it stops. Sometimes, yes, a human does it, sometimes it's resources, sometimes it's a bug, and so-on.
Start by reading the application log - look for the last time it restarted and then read backwards from there. Are there shutdown messages? "I am struggling with" type warnings or errors? Vast swathes of horrid java stack traces? Or does it just look like it's running perfectly normally and suddenly <bang> it's starting up again?
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