Adobe digital edition iPhone app shut down

For a couple of months now, when I use the Adobe digital app for Iphone, it shuts down when I'm trying to add a book. It's not always doing it; I tried with 2 different book source (prêt numérique and Numilog).

Already tried to remove and reinstall the app; tried to change the ID; still doing it. 

I can get the book, it's getting updated in the app, but then the app shuts down and even when I'm trying to reopen the app and get to a book, it shuts down again and again!