partial page loading problem

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I am working on a PHP project and having a partial page loading problem  
randomly. The PHP module 4.4.0 is running on apache server 1.3.33, with  
database connection to oracle 10g. The problem happens randomly with  
partial or blank page loaded. Refresh will get a complete page in most  
of time. I checked the error log and seems there is no specific error  
message corresponding to this problem. Anybody has the similar  
experience? Any suggestion/advice is appreciated.

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