didUpdateLocations called only once and then stops firing

I want to make a simple IOS 6.0 application that shows the lat/lon on screen each time the location is changed. The ViewController files are pretty trivial.

I alloc a CCLocationManager objec, set its variables and start it. didUpdateLocations is called once or twice and then it stops being fired, even if the iPhone is moved. If I press Home button and reopen the app, the data on screen is updated once or twice before it stops again. At simulation it works fine but not on a real 3GS iPhone.

If I uncomment the start/stop inside didUpdateLocations and continuously stop and start the service, it works, but the battery gets drained in extreme rates.

Also, this is part of a much bigger project and didUpdateLocations must be called each time the location is changed.

ViewController.h



#import <CoreLocation/CoreLocation.h>
@interface ViewController : UIViewController
@property (nonatomic , strong) CLLocationManager *locationManager;
@property (weak, nonatomic) IBOutlet UILabel *lbl;
@end


ViewConroller.m

#import "ViewController.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
_locationManager.distanceFilter = kCLHeadingFilterNone; // whenever we move
_locationManager.desiredAccuracy = kCLLocationAccuracyBest;
_locationManager.PausesLocationUpdatesAutomatically = NO;
[_locationManager startUpdatingLocation];
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
CLLocation *newLocation = [locations lastObject];
_lbl.text=[NSString stringWithFormat:@"%lf %lf",newLocation.coordinate.latitude, newLocation.coordinate.longitude];
//[_locationManager stopUpdatingLocation];
//[_locationManager startUpdatingLocation];
}
@end

If there's any advice on what's wrong, I would welcome it, I have lost a week already without solving it.

BTW, I have tested various values for the _locationManager variables but without any chnage in the behaviour

Additional info: application is authorized to use location services application is in foreground

Solution

Few tips for similar issues as per my experience with location-based programming on iOS.

If it works on the simulator, then it should work on the actual device as well.
Unlike the simulator, the actual device will only give an update when it receives new information from GPS (you need to move physically).
There are many cases where you won't get enough/required updates on a device, like when you are in a building (or covered area).
Try testing the app in open space (GPS works much better in open space rather than in streets, corridors, and courtyards surrounded by buildings).

PS. I don't know how much you moved but just to let you know, moving a few steps doesn't make sure you will get a new location update, try using it on some vehicles (bike/car/bus). Moreover, setting the distance filter to kCLDistanceFilterNone will help with testing, but it can consume 100% battery in 2-3 hours.