Ionic Geofence not working everytime

ionic-v1
1

Hello ,
I am currently trying to add Geofence in the app using ionic 2. My problem is Geofence in the app does not work all the time. Here is the code -

import { Component } from ‘@angular/core’;
import { AlertController, NavController, Events, MenuController, Platform} from ‘ionic-angular’;
import { locationsPage } from ‘…/locations/locations’;
import { LoginPage } from '…/login/login’
import { settingsPage } from ‘…/settings/settings’;
import { Geolocation } from ‘@ionic-native/geolocation’;
import { Geofence } from ‘@ionic-native/geofence’;

@Component({
selector: ‘page-home’,
templateUrl: ‘home.html’
})
export class HomePage {

constructor(public navCtrl: NavController, private events: Events, private menu: MenuController, private geolocation: Geolocation, private geofence: Geofence, public alertCtrl: AlertController,private platform: Platform) {

this.menu.enable(true, 'menu1');



this.platform.ready().then(() => {
		
		this.geofence.initialize().then(
			// resolved promise does not return a value
			() => this.showAlert('geofence.initialize'),//console.log('Geofence Plugin Ready'),
			(err) => this.showAlert(err)//console.log(err)
		);
	});		
	
	this.geolocation.getCurrentPosition({enableHighAccuracy:true}).then((resp) => {
		// resp.coords.latitude
		// resp.coords.longitude
		
				//console.log('Geofence Plugin Ready');
				
				let fence = {
					id: '61432ec1-b7b1-4c48-90dd-4b91fb30b340', //any unique ID
					latitude: resp.coords.latitude, //center of geofence radius 
					longitude: resp.coords.longitude ,
					radius: 100, //radius to edge of geofence in meters
					transitionType: 3, //see 'Transition Types' below
					notification: { //notification settings
						id:             1, //any unique ID
						title:          'YOU ARE APPROACHING abc', //notification title
						text:           'Welcome.', //notification body
						openAppOnClick: true //open app when notification is tapped
					}
				}
				
				this.geofence.addOrUpdate(fence).then(
					() => this.showAlert('geofence.addOrUpdate'),
					(err) => this.showAlert('Geofence failed to add: ' + err) //console.log('Geofence failed to add')
				);

				   
				this.geofence.onTransitionReceived().subscribe(resp => {
   
					this.showAlert('geofence.onTransitionReceived: ' + resp);
   
				});
				
				this.showAlert(resp.coords.latitude + ' - ' + resp.coords.longitude);
		
	}).catch((error) => {
		this.showAlert('Error getting location: ' + error.message);//console.log('Error getting location', error);
	});

}

showAlert(msg: string) {
let alert = this.alertCtrl.create({
title: msg,
subTitle: msg,
buttons: [‘OK’]
});
alert.present();
}

What can be the possible solution that can make my geofence work everytime I enter/exit that place?