How can I prevent a memory flow error from occuring when using 3D contour plots?

After displaying a single contour plot a number of times, LabVIEW crashes and reports a memory overflow error.  I only load a single 2D array, never storing previouls ones. I always index the data for contour plot 0, and don't explicitly store multiple 2D arrays in any buffer, such as appending data to a shift register.  There appears to be some sort of memory leak in LV when using this feature.  Is there a programatic way to flush the stored data in a contour plot prior to displaying the next 2D array of data?