Ledger sign txn on Ropsten Infura - Failed to subscribe to new newBlockHeaders to confirm the transaction receipts

tiimPrivateSale.js

import web3 from './web3';
import TIIMPrivateSale from '../build/contracts/TIIMPrivateSale.json';

const privateSaleAddress = process.env.REACT_APP_PRIVATE_SALE_ADDRESS || '0xcf0e7791eaf5baca756ae7e5ae7b64b0ab5f8b61';
const instance = new web3.eth.Contract(
    TIIMPrivateSale.abi, privateSaleAddress
);

export default instance;

TokenIndex.js

import tiimPrivateSale from './ethereum/tiimPrivateSale';

...

submitPrivateSale = async (event) => {
    event.preventDefault();

    const {investor, value, bonus} = this.state;
    
    this.closeSaleForm();

    this.setState({privateSaleLoading: true});
    const accounts = await web3.eth.getAccounts();
    const owner = accounts[0];

    try {  
      const txn = await tiimPrivateSale.methods
      .sendToken(investor, web3.utils.toWei(value, 'ether'), web3.utils.toWei(bonus, 'ether') )
      .send({from: owner});   
    } catch (err) {
      console.log(err);
      alert("Could not send private sale cause error : `" + err.message + "`");
      this.setState({privateSaleLoading: false});
      return;
    }

    const balance = await tiimToken.methods.balanceOf(this.state.privateSaleAddress).call();
    this.setState({privateSaleTiimBalance: balance});
    this.setState({privateSaleLoading: false});
    this.resetSaleForm();
  }

...

web3.js

import Web3 from 'web3';
import TransportU2F from "@ledgerhq/hw-transport-u2f";
import createLedgerSubprovider from "@ledgerhq/web3-subprovider";
import ProviderEngine from "web3-provider-engine";
import FetchSubprovider from "web3-provider-engine/subproviders/fetch";

let web3;

const rpcUrl = process.env.REACT_APP_NETWORK_URL || "http://127.0.0.1:9545";
const networkId = parseInt(process.env.REACT_APP_NETWORK_ID || "1337", 10);

const engine = new ProviderEngine();
const getTransport = () => TransportU2F.create();
const ledger = createLedgerSubprovider(getTransport, {
     networkId,
     accountsOffSet: 0
});
engine.addProvider(ledger);
engine.addProvider(new FetchSubprovider({ rpcUrl }));
engine.start();
web3 = new Web3(engine);

export default web3;