title: iOS app crash when presenting multiple Admob Mediated Interstitials
body: <p>I have implemented Admob in my iOS application. Banners, rewarded videos and mediated interstitials (Admob, Unity and Chartboost). The only problem I have is that the app always crash after 3-4 interstitial ads has been presented. The debugger shows this message: <code>Message from debugger: Terminated due to memory issue</code>.</p>
  
  <p>I am 100% sure the crash comes from the Interstitials. I have tested completely without ads, no crash. And only with banner ads, no crash.</p>
  
  <p>This is the code I use to implement and show Interstitial ads:</p>
  
  <pre><code>@interface ViewController ()
  @property(nonatomic, strong) GADInterstitial *interstitial;
  @end
  
  - (void)viewDidLoad {
      [self loadInterstitial];
  }
  
  - (void)loadInterstitial {
      self.interstitial = [[GADInterstitial alloc] initWithAdUnitID:@"ca-app-pub-xxxxx/xxxxx"];
      self.interstitial.delegate = self;
      [self.interstitial loadRequest:[GADRequest request]];
  }
  
  - (void)interstitialDidDismissScreen:(GADInterstitial *)interstitial {
      [self loadInterstitial];
  }
  
  - (void)someMethod {
      if (self.interstitial.isReady) {
          [self.interstitial presentFromRootViewController:self];
      }
  }
  </code></pre>