Freeze work item location after it is created

mobile/src/WorkItem/WorkItem.js

@@ -334,12 +334,16 @@ export class WorkItem extends React.Component {
                   height: 400,
                   marginBottom: 10,
                 }}
+                zoomControlEnabled={false}
+                zoomEnabled={!binder._id}
+                scrollEnabled={!binder._id}
+                rotateEnabled={false}
+                pitchEnabled={false}
                 showsUserLocation
                 showsBuildings={false}
                 showsTraffic={false}
                 showsIndoors={false}
-                zoomControlEnabled={false}
-                rotateEnabled={false}
+                cacheEnabled
                 initialRegion={config.initialRegion}
                 onRegionChange={this.handleRegionChange}
                 onMapReady={this.handleOnMapReady}