I'm not 100% sure, but I remember that I had this issue once with some custom POIs, and it was basically freezing iGO or quitting app. This was only happening when I used to search locations in a certain KML file, and I decided to delete that and try again. After I've done this, it worked fine. Now this might be a long shot for you, but at least it's a start... try deleting all KML files and leave only one, then repeat the process and copy them one by one on sat nav and see how it works...
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