The app is supposed to automatically remember where the audio stopped for each item you listen to, so the next time you press Play on that item it will resume from where you left off.
What version of the app are you running? Are you on iOS or Android?
Do you control the audio via an external system, like in-car Bluetooth?
Do you frequently start on one chapter and let it auto-advance to the next, or is it usually one chapter you start listening to, then stop?
Samuel Bradshaw • If you desire to serve God, you are called to the work.