Map works once / CSS height issues

Hi im using iron router to load a template than contains a GoogleMap, it works perfectly the first time you navigate to the the route, but when access again, the map not work. Heres the code

``` javascript
Template.appraisalGeolocation.created = function() {
GoogleMaps.load({v: '3', key: '12345', libraries: 'geometry'});
GoogleMaps.ready('geolocation', geolocation.readyHandler);
}
```