Estoy usando el kit de reproducción para guardar un video de mi pantalla durante el juego, pero al azar ocasionalmentestartRecordingWithMicrophoneEnabled yrecorder.stopRecordingWithHandler nunca entra en el controlador de finalización

no arroja un error, solo se ejecuta y se cuelga indefinidamente.

if recorder.available && recorder.microphoneEnabled {
    recorder.startRecordingWithMicrophoneEnabled(true) { [unowned self] (error) in
        if let unwrappedError = error {
            print(unwrappedError.localizedDescription)
        } else {
            print("called")
            self.manager.instructions.text = "Click to Start Game"
        }
    }
}

if recorder.available && recorder.microphoneEnabled {
    print("initiating stop recording")
    recorder.stopRecordingWithHandler { [unowned self] (RPPreviewViewController, error) in
        print("in completion handler")
        if let previewView = RPPreviewViewController {
            print("will transition to gameplay video")
            previewView.previewControllerDelegate = self
            self.presentViewController(previewView, animated: true, completion: nil)
            self.sessionHandler.session.stopRunning()
        }
    }
}