I live in Berlin and use the official BVG app for using the public transport here. it bugs out temporarily fairly regularly and I have to make the decision whet

I live in Berlin and use the official BVG app for using the public transport here. it bugs out temporarily fairly regularly and I have to make the decision whether to buy a paper ticket to cover me (incurring extra expense) while the app isn't working or to risk it and hope the ticket inspector doesn't stop me/shows me leniency when I demonstrate the non-functioning app. extremely annoying