Unity Video ads closing when player leaves app.

Hi guys,

We have Unity video ads integrated nicely on our mobile game. However, every time a video ad is played in between levels, the player can skip it by leaving the app (home button for iOS, back button for Android) and the opening it again immediately.

Is this behaviour intended by Unity? I remember this is not the case a few months ago when we first released our game - ads were persistent back then.

Currntly on Unity 5.3.5f1, and using Unity Ads from Services tab.

Looking forward to your insights.