Megan,

If you have forced writes disabled, the I imagine the FB Server would
get a bit excited at this point. Could be garbage collection as well.
The server will let go when it has done what it needs to do. If you
have a well designed application, this will be almost immediately in
99% of cases. You (or someone else) may have also inadvertantly made a
second connection from another process.

Out of curiousity, is it causing any problem or are you just wondering
why it happens?

Adam