Problem with SaveAs function using random paths.

Question

The Setup:
Part 1) I have a folder-level script that allows me to perform a SaveAs function from within forms. I do this as a way to save the document quietly in the background. The effect is that the file is overwritten by a copy of itself. The script is:
var mySaveAs = app.trustedFunction( function(oDoc,cPath,cFlName)
    app.beginPriv();
    cPath = cPath.replace(/([^\/])$/, "$1/");
    try{
        oDoc.saveAs(cPath + cFlName);
    }catch(e){
        app.alert("Error During Save");
    app.endPriv();
Part 2) From within my documents, I perform the save by calling the function below:
function runSave()
{if(typeof(mySaveAs) == "function") {
    var pathArray = this.path.split("/");
    var myFileName = pathArray[pathArray.length-1];
    var cPath = this.path.slice(0,myFileName);
    mySaveAs(this, cPath, myFileName);
} else {
    app.alert("Missing Save Function\n" + "Please contact forms administrator");
Part 3) I have several large forms that utilize an autosave to call the save function according to a time interval of 5 minutes, using:
app.setInterval(runSave(), 300000);
The Problem:
Part 1) The autosave feature works fine and it works silently in the background. However, I start to experience problems when I have two forms open at the same time. If, for example, I have a form from one folder open, and open a form from a second folder, the save feature will sometimes save the active document to it's original folder (as intended, overwriting itself and creating an autosave) or sometimes save to the second document's original folder. This leaves me with an updated (autosaved) copy of the document in the wrong folder, and a non-updated copy in the original folder. This seems to vary depending on which document I opened last and/or which document is currently active. Though I can't seem to find the right combination.
It's as thought the "this.path" is getting confused.
Part 2) Worse still, if the two documents have the same name, as is often the case with these forms, any incorrect filing when saving causes an overwrite of the second document and loss of data.
Part 3) To makes things maddening, this also happens at times when no second folder or second document is open. Instead, the misfiling saves the single, active document to a recently accessed folder. For example, I'll open a local folder and open a Word doc, close the doc and the folder, go to a different folder in a different root (a networked folder), open the form, and it autosaves to the local machine in the folder with the Word doc. So now not only do I have a non-updated copy in my correct folder, I have no idea where the updated copy was actually saved to until I come across it some time later.
Part 4) Again, worse still, the previously accessed folder might happen to be one that contains a document with the same name, and that document gets overwritten by the autosave. I'll have no idea that the form has been overwritten until I happen to open it some time later and see that it contains data from a totally different form.
What is going on and how do I stop it?
Adobe Acrobat X Pro on a PC.

Answer 1

Thank you, that is helpful to understand. I'd like to keep it as 3 parameters, as all my documents currently output 3 to the trusted function. And I'd still like to keep the error catch, but I'm not sure why the previous trusted function from the tutorial is no longer working, so I just want to run this by you:
safeSaveAs = app.trustPropagatorFunction(function(theDoc,thePath,theFileName){
    app.beginPriv();
    var fullPath = (thePath + theFileName);  
    try {
        theDoc.saveAs({cPath:fullPath});
    } catch(e) {
        app.alert("Error During Save");
    app.endPriv();
myTrustedSaveAs = app.trustedFunction(function(theDoc,thePath,theFileName){
        app.beginPriv();
        safeSaveAs(theDoc,thePath,theFileName);
        app.endPriv();