DiegoM
I have managed to install Android studio, and try the Delay sending events, but it makes no difference.
Although I have got it working, but I had to install firebase from android studio, which you shouldn't have to according to the Admob documentation, all you should have to do is install the latest Google Mobile Ads SDK 18.1.0 or later.
So therefore I can only assume it's a problem somewhere in the Cordova Admob plus plugin.
Hopefully a solution can be found as exporting and building with Android Studio is just another series of extra work to do.
Cheers