iBooks stops playing

Heya!

iBooks stops playing audiobooks when I lock screen, exit the app or after a few minutes when it auto-locks the screen.

Before I would go running, driving, etc. while listening to my audiobooks, but now I can't anymore. I do not think I have touched anything, just the regular "update all" in app store.

Any idea how to get audiobooks back? For now I must keep tapping the screen to avoid lock-screen, and as such have started listening to my audiobooks on another device ..which is, feels sorta silly

any help is appreciated