tomcat is not responding

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I am using tomcat 6.0 to run jsp. It will run only 5minuts after is not responding, i try to restart again and it will work another 5 minutes.
I am running port no is 9000.
server.xml configuration is shown bellow.

<connector port="9000" protocol="HTTP/1.1">
       minSpareThreads="25" maxSpareThreads="75"
       enableLookups="false" acceptCount="100" debug="0" 
       connectionTimeout="20000" disableuploadTimeout="true"
       redirectPort="8443">
</connector>

Any one can help me..

Thanks in advance.