Admob official plugin no internet connection problem.

Hi, I’m new to this plugin (admob oficial form here: GitHub - googleads/googleads-mobile-unity: Official Unity Plugin for the Google Mobile Ads SDK). I have a small game with tree scenes: intro, main menu and game. In the intro scene I make a requiest for banner and show it, works fine. The problema comes when the divice has no internet conection, lets say that the intro sceen is a splash creen for 5 seconds, but when is no internet connection the scene is changed to the next scene(main menu) Immediately. It’s a bug or i must check if there is a internet conection?.If I must check if there is a connection how to made it ?

On my game i use:

if (Application.internetReachability != NetworkReachability.NotReachable){
    //Connected
}