System hangs after 2-3 hours of use

[Twele, Charles G]

My Tomcat 3.1 application hangs after a while. However, if I restart Tomcat
again all goes well for some time i.e. 2 to 3 hours and then it goes down
again. I am using Apache 1.3.12 and Tomcat 3.1 on Win NT

Anyone encountered this problem with Tomcat?