How to reset Accelerometer Event As3 - actionscript-3

Question

In my project, at the start of game accelerometer event works fine. While game reaches the game over page and click on restart button. All the objects are working good when restarting the whole game also all values have been reset but accelerometer is not working.
Thanks in Advance.
The code follows:
if (Accelerometer.isSupported)
{
acc = new Accelerometer();
acc.addEventListener(AccelerometerEvent.UPDATE,updateFn);
}
public function updateFn(e:AccelerometerEvent):void
{
targetX = e.accelerationX * 9.8;
}

Answer 1

Just register the Accelerator once the app was launched/activated and save it's value to global variables on each accelerator update and disabled it each time the app is put to the background / deactivated / exit. Eg:
NativeApplication.nativeApplication.addEventListener(Event.DEACTIVATE, handleApplicationDeactivated);
NativeApplication.nativeApplication.addEventListener(Event.ACTIVATE, handleApplicationActivated);
function handleApplicationActivated( e:Event):void {
// Check if Accelerometer is already activated
if( acc != null ) return;
acc = new Accelerometer();
acc.addEventListener(AccelerometerEvent.UPDATE,update);
}
function update( e:AccelerometerEvent ):void {
GlobalVars.accX = e.accelerationX;
GlobalVars.accY = e.accelerationY;
GlobalVars.accZ = e.accelerationZ;
}
function handleApplicationDeactivated( e:Event):void {
acc.removeEventListener(AccelerometerEvent.UPDATE,update);
acc = null;
}
edit: you might will want to use this activate/deactivate code instead : NativeApplication DEACTIVATE-ACTIVATE app when in the background since the NativeApplication have some issues.