If you are using react-navigation in your project. You have to follow these instruction. In iOS Release mode, react-native application crash between navigating pages. Possible problems:
software-mansion/react-native-gesture-handler#320
To fix problem:
software-mansion/react-native-gesture-handler#320 (comment)
import "react-native-gesture-handler"; // Just add the top of index.js(root of project)
import { AppRegistry } from "react-native";
import App from "./src/App";
import { name as appName } from "./app.json";