problem with PHP 5.0.4 isapi on Windows 2000 IIS6

Hi, I have a problem where it seems that once PHP has completed the page then not exiting. The subsequent request of the same page is then throwing an error that it is trying to redeclare a function. It seems like the PHP is still running of the last request with the old page still in memory and then it is trying to process the new page and getting name space issues. Also I am then getting access violation errors and I the page seems to be locked by another process. Then the only way to get around this is to then restart IIS. when the problem occurs I am getting no errors. I am at a loss on how to diagnose this or even where I can go from here. Any help will be most appreciated. As I am not subscribed to the list please be sure to respond directly to me as well as the list. Thanks in advance. Gordon.