App is getting into Idle State after some time.

Question

I am running a loop of videos in my UWP app. My app works in such a way like i have to call an api when app is invoked and have to call another api when app is closed by checking visibility status of the app.if it is quick like open the app and closing the appand so on, it works fine by calling api at launch and closing time,but  "When i leave the app running with videos for quite sometime without any interaction then the app is unable to call the api before its closed". Can anyone suggest when my app gets into idle state if i wont interact with it or is there a way like i can run my app all the time even though if it is not interacted.