Admob Ads shown only after second request

Hi,

I'm using a Admob plugin (https://github.com/nabrozidhs/unity_admob_android) and I am able to show banners and interstitials but I have a problem :

The banners are shown only after a second request. For example : on the homescreen I have a banner. When I enter the game I see no banner.If I navigate to another scene and then back to the first then the banner is shown.

Also if I make the banner visible on button click, I have to click twice on the button to show the banner.

What is interesting is that the banner is shown if I wait for about 1 min (this is the banner refresh time) or if I lock the phone and than unlock it.

So it seems it it needs a screen "refresh / reload" to work.

What can I do to make the banner visible on the first load? Can I force a screen refresh in Unity ?

Thank you !