strange tomcat problem

My TOmcat standalone works when i give http://209.217.52.60:8080
Also my virtualhosts are working proper
But what happens is after some time probably around 24 hours the servlets and Jsp files on virtual hosts give 500 error or page nout found.

When this error comes the Standalone still works and i can see the samples.

If i just stop the tomcat engine and start it again, the virtualhosts start working again,

What can be the reason for this behaviour.

Regards

 

 

 

 

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