So, it is improved somewhat on the latest DP released today.
I still get crashing, but it seems like the crashing is related to notes I create using the document picker in iOS 11. If I web clip a note on my Windows PC, it opens fine in Evernote. If I clip it via the document picker, the app crashes when I open it.
I wonder if this explains why some people didn't have the problem, and others did. it may well be that this has been the issue all along.