I am working on a project with a tableView controller and the detail views contains CMMotionManager.When i open 5 or 6 detailViews all goes well,but after a while the app goes slow and finally crashes.On instruments the only leak is on main.m , also i must say that I'm using ARC and i can't dealloc or realese the instances.

Here is the code: First the table view:

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.title = @"Movement";//Master View Controller title bar
    UIImage *image = [UIImage imageNamed:@"jg_navibar.png"];
    [self.navigationController.navigationBar setBackgroundImage:image      forBarMetrics:UIBarMetricsDefault];

    //Init the array with data
    bodypartsMutableArray = [NSMutableArray arrayWithCapacity:26];

    BodypartData *part1 = [[BodypartData alloc] init];
    part1.bodypartname = @"Shoulder";
    part1.movementname = @"Flexion";
    part1.fullimageStartingPosition=[UIImage imageNamed:@"2_shoulder_flexion_end_position.jpg"];
    part1.fullimageEndedPosition=[UIImage imageNamed:@"2_shoulder_flexion_end_position.jpg"];
    part1.thumbimage=[UIImage imageNamed:@"1_shoulder_flexion_landmarks_thumb.jpg"];
    [bodypartsMutableArray addObject:part1];

.........
}

then the cell:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    UITableViewCell *cell = [tableView
                         dequeueReusableCellWithIdentifier:@"MyBasicCell"];
    BodypartData *part = [self.bodypartsMutableArray objectAtIndex:indexPath.row];
    cell.textLabel.text =[NSString stringWithFormat:part.movementname];
    cell.detailTextLabel.text =[NSString stringWithFormat:part.bodypartname];
    cell.imageView.image =part.thumbimage;
    return cell;

}

and the the detailViewdid load:

- (void)viewDidLoad
{
    [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
    // Init motionManager object and set the Update Interval

    _motionManager = [[CMMotionManager alloc]init];
    _motionManager.deviceMotionUpdateInterval=1/60; //60 Hz
    [_motionManager startGyroUpdates];

    if (_motionManager.gyroAvailable) {
        _motionManager.gyroUpdateInterval = 1.0/60.0;
        [_motionManager startDeviceMotionUpdatesToQueue:[NSOperationQueue currentQueue]
                                       withHandler: ^(CMDeviceMotion *motion, NSError *error)
         {
              CMAttitude *attitude = motion.attitude;

             //Calculation with rotationMatrix
             m11 = [NSString stringWithFormat:@"%.02f", attitude.rotationMatrix.m11];
             m12 = [NSString stringWithFormat:@"%.02f", attitude.rotationMatrix.m12];
             m13 = [NSString stringWithFormat:@"%.02f", attitude.rotationMatrix.m13];

.........
}