AVErrorMediaServicesWereReset in AVCaptureSessionRuntimeErrorNotification - ios

Question

I have a problem with AVCaptureSession startRunning. It's problem only on iphone 5 with IOS 7. My app should record video and show all on AVCaptureVideoPreviewLayer, but if I test on iphone 5, first time call error = AVErrorMediaServicesWereReset.
This is my code, where I create capturemanager and startRunning:
-(void)startVideoTranslation{
CGRect r = videoBackView.bounds;
videoPreviewView = [[UIView alloc] initWithFrame:r];
[videoBackView addSubview:videoPreviewView];
if (currentGameType == MPGameTypeCrocodile){
if (captureManager == nil) {
captureManager = [[AVCamCaptureManager alloc] init];
[captureManager setDelegate:self];
if ([captureManager setupSession]) {
//Create video preview layer and add it to the UI
AVCaptureVideoPreviewLayer *newCaptureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:[captureManager session]];
CALayer *viewLayer = [videoPreviewView layer];
[viewLayer setMasksToBounds:YES];
CGRect bounds = [videoPreviewView bounds];
bounds.origin.y = bounds.origin.y+1;
[newCaptureVideoPreviewLayer setFrame:bounds];
if ([newCaptureVideoPreviewLayer.connection isVideoOrientationSupported]) {
[newCaptureVideoPreviewLayer.connection setVideoOrientation:AVCaptureVideoOrientationLandscapeRight];
}
[newCaptureVideoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[viewLayer insertSublayer:newCaptureVideoPreviewLayer below:[[viewLayer sublayers] objectAtIndex:0]];
captureVideoPreviewLayer = newCaptureVideoPreviewLayer;
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(isErrorSession:) name:AVCaptureSessionRuntimeErrorNotification object:nil];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), ^{
[[captureManager session] startRunning];
});
}
}
}
}
And this selector I call here:
-(void)showPrepareView{
[self playSound:#"start"];
BGView.frame = videoBackView.bounds;
[prepareView addSubview:videoBackView];
[self startVideoTranslation];
[videoBackView addSubview:BGView];
In this code I use AVAudioPlayer in [self playSound:],
on videobackView i add my PreviewLayer.
Does anyone know the reason for this problem?
Now,I solve this problem so, I move in -(id)initWithFrame:
captureManager = [[AVCamCaptureManager alloc] init];
[captureManager setDelegate:self]
[captureManager setupSession];
[[captureManager session] startRunning];
But I don't understand what is it.