Redux store (AsyncStorage engine) freezes iPhone when calling store.dispatch

For our ReactNative app we are eliminating loading times by using internal storage. Initially the data from the redux store makes an immediate render possible while an api call is made to update the data. After the api call is made the newest data is stored with store.dispatch.

Everything works well on Android and simulators, but on iPhone X the app freezes when store.dispatch is called. Deleting the dispatch "solves" the issue.

What could the problem be? Should we try another storage engine?

Edit: I created a basic redux app based on our coding: https://snack.expo.io/@adriaandebolle/react-native---redux-store. Using the Expo client this works fine on iPhone. So it wasn't possible to reproduce the issue...

Our store.js file:

import {createStore, compose, applyMiddleware} from 'redux';

import thunk from 'redux-thunk';

import {persistCombineReducers, persistStore} from 'redux-persist';
import AsyncStorage from '@react-native-community/async-storage';

import {encryptTransform} from 'redux-persist-transform-encrypt';

const encryptor = encryptTransform({
  secretKey: '******',
  onError: function (error) {
    // Handle the error.
    console.log(error);
  },
});

const config = {
  key: 'primary',
  storage: AsyncStorage,
  transforms: [encryptor],
};

import {reducer as servicesReducer} from 'app/services/reducer';

const appReducer = persistCombineReducers(config, {
  services: servicesReducer,
});

const enhancer = compose(applyMiddleware(thunk));

const store = createStore(appReducer, enhancer);

const persistor = persistStore(store);

export {store, persistor};

Dependencies package.json

{  
  "dependencies": {
    "npm": "^6.14.8",
    "react": "16.13.1",
    "react-native": "0.63.4",
    "react-navigation": "^4.0.10",
    "react-navigation-stack": "^1.9.4",
    "react-redux": "^7.2.2",
    "redux": "^4.0.5",
    "redux-persist": "^6.0.0",
    "redux-persist-transform-encrypt": "^3.0.1",
    "redux-thunk": "^2.3.0",
    "remote-redux-devtools": "^0.5.16",
  },
}