Servers will crash on their own even if it's on a high end computer

So when I make a server, I did it all right and made sure it had enough RAM to run. I get on and like 3 minutes later, it shuts off on its own. So I ask my friend to make it, the same thing happened.
But it's only on snapshots, not 1.7 .
So I tried to go on a older snapshot, and it didn't shut off. It's only in the latest snapshots