Application.Quit Does Not Fully Kill App

I am making an Android game and am trying to use Application.Quit to leave the app. This works fine and the app closes. However, when I try to reload the app, it crashes my phone. I have to use the home button to get back to the main screen, kill the app process and the reload it.

I’m not too sure what is going on or how to rectify the issue. This is the only device (SGS4) I can test it on as well.

Any ideas?

Just a note that your advert is actually very likely what is causing the crash. You need to end the advert call before quitting the app. Running into the same issue now.