"webpage has expired" remedies

Hello, Could someone suggest the steps needed to troubleshoot the "webpage has expired" issue in IE. I have a self-posting php form which queries and writes to a pgsql database. Occasionally, when an input is entered, the form never loads and I get this error instead. I do want to make clear that this has nothing to do with using the back button on the browser, as most instances of this error do. I also cannot reliably reproduce this error on IE. Sometimes it occurs several times on a specific input, but the next minute the same exact input is processed without any issues. It does seem to be associated with especially onerous queries that take the (gis) database a while to process, but sometimes even quick queries cause it. Also, as I mentioned, this only occurs on IE, not on firefox or safari. Feels almost as some kind of a timeout that IE responds to, but I don't know much about these things and would appreciate any guidance. Best regards, --Ed Bukhman