Changing value of an entire Array causing problems

I have a function (myFunction) that returns an array of Vector3 positions. I then have an array (myArray) that calls this function from time to time. I want to make the array equal to what the function returns. Here is an example.

 //This part works fine, like it should.
 var myArray : Array = new Array();
 myArray = myFunction();
 
 //This returns a Vector3, like it should.
 var position : Vector3 = myArray[0];
 
 //The problems come when I try to change myArray later on.  myFunction returns different results, so the length and positions returned by myFunction will vary.
 myArray = myFunction();
 
 //This causes Unity to crash and an error message saying "Fatal error in Garbage Collector: Too many heap sections".  There is nothing wrong with my function.  I can call the function as much as I want, and assign it to other variables.  The problem comes when I try to reassign it to the same variable.
 
 //I've also tried reassigning myArray to new Array() again before assigning it to myFunction.  No luck.

Anyone know what the problem is? I would really appreciate the help. I've been working on this project all night. I've got the whole thing working, but this is the one part that stumped me.