Why does MYSQL shut down? ([Note] /usr/sbin/mysqld: Normal shutdown )

I am trouble shooting some forum issues on my site, and I checked the mysql error logs and I saw this:

080903 21:15:21 [Note] /usr/sbin/mysqld: Normal shutdown

080903 21:15:21 [Note] /usr/sbin/mysqld: Shutdown complete

080903 21:15:21  mysqld ended

080903 21:15:22  mysqld started
080903 21:15:22 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.0.51a-community'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Edition (GPL)

Code (markup):

Why did the MYSQL shutdown and restart? I don't see anything here that can tell me why this is happening...anyone got a clue?

 

Is this a shared server? It sounds like someone or a script is restarting the mysql server.

 

Its a dedicated server

 

Don't know why it shutdown. But I recommend installing monit to automatically restart it in case it happens again:

http://www.tildeslash.com/monit/

 

Was there anything in the log above the shutdown line?