Hi @John2, thanks for reporting this issue!
iOS 11 does seem a lot more aggressive on limiting each appās memory usage, and weāre investigating related app crash issues.
Does the document youāre working with happen to be huge?
If so, especially if you just imported all your data from somewhere else, we recommend breaking it down a bit (you can drag items to the left pane to quickly convert them into individual documents). Also when freshly imported, everything is expanded by default. That makes it more taxing on the memory.
Sorry about the inconveniences!
P.S. Also this seems like the same issue Dynalist on Iphone 7+ with IOS 11.0.3 hanging on startup