It's a problem with your network.
https://confluence.atlassian.com/display/JIRA/Surviving+Connection+Closures might help improve Jira's response to the fault, but you probably need to talk to your network engineers and DBAs to find out why the connection is being lost.
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Depends on how you've installed it. You should consult the documentation for your version, or the team that maintain the server.
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