VB Script/VB.NET Expert Needed

We are having problems with an ASP form on one of our websites. For some reason, files are getting overwritten by the form at random times. Most of the time the forms work fine, but randomly it will take the data from one XML file and overwrite it into a different XML file, sometimes multiple XML files. When this happens, we lose all the form data in the overwritten XML files. I can send you a ZIP file containing all the files involved with the ASP form for you to look at. The form is still actively in use on the site, so we don't want to take it down or break it while it is in use. The forms can be found here, just click on any of the calendar dates: [login to view URL] Just let me know what you need.