Pinakothek der Moderne App

I never write reviews for apps but I’m so annoyed by the thoughtlessness of this that I felt compelled to write one. This app has incredible information, pre curated walkthroughs and I love the way it’s flexible and allows you to put together your own ‘walks’. BUT the audio commentary ONLY works if your phone is open and the app is open (not backgrounded). How is this helpful?? It drains my battery if I want to keep it on, or otherwise abruptly shuts off if my phone auto closes or I switch apps to write a note or a take a photo. It makes me want to leave the museum altogether. Developers, please fix this for the next users.