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It will happen when you log on but don't change page, post or refresh for a while. A "security ticket" is issued - basically a value that has to match at both end of the connection - and is updated every so often whilst you are logged on - it's an automatic process that happens in the background - and if you remain logged on with no activity your ticket may no longer match the one that the system is expecting to see.
When you the post after a long period of inactivity the system will either update the ticket automatically or it may sometimes instruct you to refresh the page or press the "Back" button in your browser to force an update ticket to be issued.
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