When Resuming game after losing focus I just get a black screen?

Hi Guys,

I'm a new developer to Android using Unity. I have an issue where when losing focus on the app for any reason when I come back I just have a black screen then it crashes after a minute or so?

So if someone taps an ad or hits the home button the app will pretty much crash. Anyone else had this issue? or know how to fix it? I was looking into the OnApplicationFocus and OnApplicationPause but haven't been able to get it to resume successfully. Just loading back to the main menu would be fine for me lol.

Thanks :D

If there was any output I could gather and post I would but I don't know where to look once it is installed on my phone?