[rt-users] Some users being forced to reauthenticate more often than others

[Jeff Blaine]

RT 4.2.5

We're trying to track down an issue where some users are being forced to
reauthenticate to RT 3-4 times per day while others aren't. This RT
instance is using the builtin authentication targeting the 'rt4' database.

Our session-cleaning cron job is as follows

    0 * * * * /apps/rt4/sbin/rt-clean-sessions --older 2D

Any suggested paths to start down would be welcome.

What might cause this?