Just another thought. Since you are already using PHP for part of your application you can do a little more "debugging" using PHP to write a log each time your genxml2.php script is called. I would keep record of a timestamp, the values of the parameters lat and lng, how many store locations have been found and most important of the user agent (HTTP_USER_AGENT). This way you could collect a lot of data and check whenever a problem is reported. This way you should be able to figure out if there's a problem with the params handled over to the PHP script, the PHP script or the following XML parsing in your JS - and you can take a look at the HTTP_USER_AGENT to see if this only happens with certain browser-OS combinations.
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