Word document crashes

Every time I leave my word document open in my iPads and search for something and then get back to the document, it crashes, that is, it suddenly disappears. I did all the available suggestions to solve the problem including “clear all the documents,” “delete sing-in credentials,” and “reset cloud settings” in Setting of my iPads (11 and 12). I even deleted the app and downloaded it again. None of them worked. Of course, I don’t have the same problem with my old iPad, 10. That’s killing me.