CoreMotion events while the app is running in background or phone is sleeping

Hi All,

I have been doing some search on how this can be done and it seems that current apps use the following key in info.plist to let it run in the background:

<key>UIBackgroundModes</key>
    <array>
        <string>audio</string>
    </array>

Then I have started CoreMotion.StartAccelerometerUpdates on AppDelegate's DidEnterBackground method like this:

`public override void DidEnterBackground (UIApplication application) { Console.WriteLine ("App entering background state."); cm = new CMMotionManager (); int taskID = UIApplication.SharedApplication.BeginBackgroundTask ( () => {});

Thread task = new Thread (new ThreadStart ( () => { 
    cm.StartAccelerometerUpdates (NSOperationQueue.MainQueue, (data, error) => 
    {
         Console.WriteLine ("Motion: " + data.Acceleration.X.ToString("0.000000000"));
    });
 }));
 task.Start ();

}`

Now this works great... up to around 9 to 10 minute mark at which point it terminates. What am I doing wrong here?