seen corruption

[ssureshot]

I have a user that has had a corrupted seen file two times this week.
The process I have done to fix is simply kill user process's and rename 
the user.seen file then have the log back in and all starts working..

My question, is this all I need to do? Do I need to run a reconstruct on 
their mailbox? Any special steps?

Any input on what could possibly be causing this? Corrupt email client?

Thank you
Aaron