Prevent Android Application from dying on resume...

Hello, I have big trouble keeping alive my android application built with Unity.. I just build an empty local push android project and when I leave the app pressing Home button and coming back to the app, it restart. I don't want it to restart.. I need to come back into the app and I need it to run in background if I don't close it. How do I avoid this ? I don't remember that was the case before Unity 2017.. I need it alive to send me local notif by the way.

Can someone have an idea ? I found nothing on the internet, only old topics with no success Thanks