IPhone keeps taking me out of app?

When every I'm on an app on my phone it takes me out of it and takes me back to the home screen again ( witch I no is a crush) but my question is why does it crush and takes me to the home page all over again it gets me really mad that I have to go back in to the up then it restartes the whole app from if you just went into it from beging why does it do this?

Double click the home button. Then swipe up on all the apps. It might work. I don't know.

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