Notability locked up a document. I shut down the app manually and restarted it only to find the document gone. Fortunately, it was only a short interview and I was able to reconstruct it from memory.
After that I switched back to using a paper notebook and pen. And found I liked it much better than digital note-taking. I still had all the muscle memory of my previous years using notebook and pen, even though I’ve been using the iPad (and briefly a Nexus 7) for all my field notes for several years now. And whipping out a notebook while having drinks with a business contact is much more human than whipping out an iPad and stylus. So I think I’ll be sticking with the notebook and pen, at least for a while.