When adverts are playing after a move in Android SCRABBLE, I use the Backup button on my phone to exit the advert and return to the game. This works fine for picture adverts, including animated adverts. However, if a video advert starts, using the Backup button quits SCRABBLE altogether. Which is rather annoying.
For a short period of time, this appeared to have been fixed. It came back in the last update to the SCRABBLE for Android app.