500D memory increase suddenly
I have 500D with Firmware Version v5.2.13,build762 (GA)
It operate with memory usage 40%.
Yesterday, it suddenly increase memory usage to 9X%,
And all sessions force to disconnected.(40K sessions)
But after 5 minute, it recover automatically.
I have log server,
But it didn't catch any log in that 5 minute.(But other time log has been stored)
How can I find the root cause in the remaining log?