Swift SpriteKit: iAd loading bug - ios

Question

I currently have a bug with the app I am working on where when a user taps on an iAd banner and the ad loads, the game resets. By "resets" I mean all their progression (other than the NSUserDefaults data) is reset to 0 and the scene is reset back to the start of the game.
My game primary runs from didMoveToView() and touchesBegan(). In my GameViewController the game scene is built from viewWillLayoutSubviews().
Here is how I control my ads and placement. Not sure if has to do with the placement of my code or the ad.
import UIKit
import SpriteKit
import iAd
// Global Ad Variable
var adBanner: ADBannerView!
class GameViewController: UIViewController, ADBannerViewDelegate {
/* Load Ads */
func loadAds() {
adBanner = ADBannerView(frame: CGRect(x: 0, y: view.bounds.size.height - 50, width: 320, height: 50))
adBanner.delegate = self
adBanner.hidden = true
self.view.addSubview(adBanner)
}
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
if let scene = GameScene(fileNamed:"GameScene") {
// Configure the view.
let skView = self.view as! SKView
// Create and Configure the scene
scene.size = skView.bounds.size
skView.showsFPS = false // SHOW OR HIDE FRAMES PER SECOND
skView.showsNodeCount = false
/* Sprite Kit applies additional optimizations to improve rendering performance */
skView.ignoresSiblingOrder = true
/* Set the scale mode to scale to fit the window */
scene.scaleMode = .AspectFill
skView.presentScene(scene)
}
}
override func awakeFromNib() {
super.awakeFromNib()
loadAds()
}
override func shouldAutorotate() -> Bool {
return true
}
override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
if UIDevice.currentDevice().userInterfaceIdiom == .Phone {
return .AllButUpsideDown
} else {
return .All
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Release any cached data, images, etc that aren't in use.
}
override func prefersStatusBarHidden() -> Bool {
return true
}
func bannerView(banner: ADBannerView!, didFailToReceiveAdWithError error: NSError!) {
adBanner.hidden = true
print("There was an error loading ad")
}
func bannerViewWillLoadAd(banner: ADBannerView!) {
print("Ad Loading")
}
func bannerViewDidLoadAd(banner: ADBannerView!) {
adBanner.hidden = false
print("Ad Loaded")
}
}