Service desk not responding

Service desk not responding

Good day,

I have a problem, when I loading a letter into the service desk with an attachment of more than 1 mb, the service desks hang.
What could be the reason?
When SD tries to process the letter CPU Load Process Java on 99,9%
Sevice desk has been updated to the latest version.
Server service desk Ubuntu 12.04.3 LTS
kernel version 3.8.0 - 29-generic

Thank you.

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