Xamarin Forms Lifecycle - xamarin.forms

Question

As App.cs is provided from Xamarin Forms I do bootstrap some of the stuff like AutoMapper there. However sometimes when the app is long in the background then the App's constructor fires again when going back from background.
This makes a bit exception since initial stuff being done twice or more.
Is that normal behaviour of XamarinForms lifecycle?
public App()
{
//Its called multiple times since app is running and going back from the background
InitializeComponent();
Bootstrap(new AppContainer(),
new TranslationBootstrap(),
new MapperBootstrap(), );
Navigate();
}
EDIT:
This happens on Android
MainActivity.cs
protected override void OnCreate(Bundle bundle)
{
TabLayoutResource = Resource.Layout.Tabbar;
ToolbarResource = Resource.Layout.Toolbar;
base.OnCreate(bundle);
Rg.Plugins.Popup.Popup.Init(this, bundle);
CrossCurrentActivity.Current.Init(this, bundle);
RequestedOrientation = ScreenOrientation.Portrait;
AppDomain.CurrentDomain.UnhandledException += CurrentDomainOnUnhandledException;
TaskScheduler.UnobservedTaskException += TaskSchedulerOnUnobservedTaskException;
global::Xamarin.Forms.Forms.Init(this, bundle);
UserDialogs.Init(() => this);
InteractiveAlerts.Init(() => this);
LoadApplication(new App());
}
private static async void TaskSchedulerOnUnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs unobservedTaskExceptionEventArgs)
{
var newExc = new Exception("TaskSchedulerOnUnobservedTaskException", unobservedTaskExceptionEventArgs.Exception);
await LogUnhandledException(sender, newExc);
}
private static async void CurrentDomainOnUnhandledException(object sender, UnhandledExceptionEventArgs unhandledExceptionEventArgs)
{
var newExc = new Exception("CurrentDomainOnUnhandledException", unhandledExceptionEventArgs.ExceptionObject as Exception);
await LogUnhandledException(sender, newExc);
}
internal static async Task LogUnhandledException(object sender, Exception exception)
{
var logger = DependencyService.Get<ILogger>();
await logger.LogAsync(sender, exception.Source, exception.Message, LogType.Fatal);
}
protected override void OnResume()
{
base.OnResume();
if (ContextCompat.CheckSelfPermission(this, Manifest.Permission.WriteExternalStorage) != Permission.Granted)
{
ActivityCompat.RequestPermissions(this,
new[] { Manifest.Permission.WriteExternalStorage, Manifest.Permission.ReadExternalStorage }, 101);
}
}