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"Unknown or expired link."

Can somebody please explain why this happens? I'm pretty sure there is solid reason behind it, but it just evades me. Why expire?
( 3 comments | 3 points | on HN )
Re:"Unknown or expired link." by pg on Tuesday May 10, 2011 @12:50PM (#2533164)
They refer to closures stored on the server. If they don't time out eventually, you have a memory leak.
Re:"Unknown or expired link." by jmcguckin on Tuesday May 10, 2011 @01:22PM (#2533315)
Yes, but the default timeout is too low. I can rarely get three or four pages deep into HN before the timeout. It seems like this changed recently.
Re:"Unknown or expired link." by mindcrime on Tuesday May 10, 2011 @02:02PM (#2533477)
I've noticed the same thing; the timeout value seems to have changed sometime in the past week or so. I now routinely get the "expired link" message after only a little bit of HN browsing. :-(