Page flickering when changing page from sidemenu

Ionic Framework
1 
//app-routing.module.ts

  {
    path: '',
    loadChildren: './views/full/full.module#FullPageModule',
    canActivateChild: [AuthGuardService]
  },

//full.module.ts


  {
    path: '',
    redirectTo: 'home',
    pathMatch: 'full'
  },
  {
    path: 'home',
    component: FullPage,
    loadChildren: './home/home.module#HomePageModule'
  },
  {
    path: 'invoice',
    component: FullPage,
    loadChildren: './invoice/invoice.module#InvoicePageModule'
  },
  {
    path: 'client',
    component: FullPage,
    loadChildren: './client/client.module#ClientPageModule'
  },

when changing tabs, i am experiencing flickering of the whole page, rather than just loading the child page, i am not experiencing when using angular, just here in ionic.

i have 2 ion-router-outlet, one has main attribute

EDIT: it seems like a problem of RouteReuseStrategy when using IonicRouteStrategy. (removing this line fixed it) any side effect of this?

EDIT EDIT: https://github.com/alainbelez/ionic-starter i have created a github repo