I tend to read my news one folder at a time. On the iOS app, when you select a folder, it hides the folder list, and you have to push a “back” button to return to that list. About two-thirds of the time, when I push that button, the app crashes. It seems to happen more often when I’ve marked some news read within that folder than when I haven’t.
I too have the same problem. It mainly occurs when reading a folder with a large (>10) number of unread items in it