Server becomes unresponsive for unknown reason

[huni]

Hello,

I am running a busy server based on netty. Occasionally -like once a week-,
I experience a lockdown on the server, which causes the server become
unresponsive to clients. I have to kill and restart the server to make it
continue its normal operation.
I am logging exceptions, but logs dont show any evidence about this
situation. I also have a memory dump of the process when the lockdown
occured, but I don't know where to look for clues.

Is it possible to be caused by a systematic attack? Like, some clients
opening massive connections or sending massive data?

Do you have any other ideas why something like this might occur?

Thanks.
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