Strange CF Error

tallgal2007

I have a strange CF Error. My page was developed in a framework designed by the company I work for. It is an MVC-based framework and for security reasons, I can not give you the details. However, there is a page that when you add a record, the code behind first deletes any record and then re-enters it, to prevent users haing the same record twice in the database. If you do this the first 4 times it's fine, but after the 4th time, the application just runs forever, until the screen is blank. The delete function on its own works fine, so something must be wrong with the add error.
The code does something like this:
<cfloop list="list of items chosen by user" index="i">
<cfquery datasource="datasource">
DELETE FROM table WHERE staff_id=i
</cfquery>
<cfquery datasource="datasource">
INSERT INTO table(staff_id)
VALUES(i)
</cfquery>
<cfloop>
We've checked the JDBC datasource and it connects to the underlying Oracle database properly.
Is there any reason this is happening?

Nikki