100% cpu usage in simulator and device about ksreachability HOT 4 OPEN

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) KSReachability *reachability;
@property (strong, nonatomic) ViewController *viewController;

@end

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.reachability = [KSReachability reachabilityToHost:@"google.com"];
    self.reachability.notificationName = kDefaultNetworkReachabilityChangedNotification;
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleReachabilityChanged) name:kDefaultNetworkReachabilityChangedNotification object:nil];

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];

    return YES;
}

- (void)handleReachabilityChanged {
    NSLog(@"handleReachabilityChanged");
}

@end