Please follow the steps below to do this:
1. Open the Settings app on your phone (Pull down the notifications shade, and tap the gear in the upper right corner, or find “Settings” in the App Drawer)
2. Tap Battery
3. Tap the menu button and choose "Battery optimization"
4. Tap the drop down menu at the top of the screen and select "All apps"
5. Scroll down to Podcast Addict, tap it and select "Don't Optimize"