Colludium No I don't, I just have preload banner at the start of layout and show banner ad bottom on the next layout. But I will add that to the events and see if it works any better. Thank you.
I use to have that same issue, here's what I did to fix it.
On start of game layout, I call in a preload banner Ad. Then after loading all the game variables and game start, I put in a wait 5 seconds, then Show Banner. Works every single time. Way I see it, need to give it some time to communicate with CJS, Mopub, AdMob, then download the Ad. If you change layout, it will reset, and you call in the Ad right away it may not have enough time.