network error

Hi, has anyone ever seen the message "Network error occured while Netscape was receiving data ..." This happens when i save data in my informix database. The values are saved, but i get the error message when the browser trys to load the new page. The strange thing is, it happens only sometimes on various sites. I think it has something to do with the traffic on the site (ca. 400 users). After inserting a flush() into the page, which i want to load, i get parts of the new page. I saved this page on disk and had a look at the HTML, it´s complete, but my browser can´t show it and i get the network error message. If i make a "View Source" of the uncomplete page i get: <TITLE>Missing Post reply data</TITLE> <H1>Data Missing</H1> This document resulted from a POST operation and has expired from the cache. If you wish you can repost the form data to recreate the document by pressing the <b>reload</b> button. I´m working on NT4, php4.0.4pl1, ODBC-> Informix Database Thanks for any help! Claudia