Without more information it would be difficult to tell what's going on. I would take a look in the JIRA_HOME/log/atlassian-jira.log and the JIRA_INSTALL/logs/catalina.out logs to see if there are any clues there as to what is going on. If you find something and need help interpreting it you can paste it here.
In addition there is a current bug ticket that you can find at JSWSERVER-14817 that may describe this behavior you're seeing. If so please vote on the bug so you will be notified of any changes to the ticket.
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