使用重要位置管理器的app会在设备上意外关闭，但不会在模拟器上关闭

I hope some one can help me. I'm developing a iOS 6 app on xcode 4.5.2, the app use significant-change location service, it detects the localization uses reverse geocoding and upload the country code, adminArea, subAdminArea, locality and sublocality to an online DB using a web service. on the iphone simulator it works fine, but on iOS devices it directly get closed with no reason. if i deactivate the location services to my app it runs ok, but when it have permission to use these it closes within one second.I hope some one can help me. I'm developing a i