Using vlc player in xamarin.android project

I am trying to use vlc player in my Xamarin.android project and install
-VideoLAN.LibVLC.Android
-LibVLCSharp

and use it like

             Bundle extras = Intent.Extras;
            this.VideoPath = extras.GetString(INTENT_KEY_PARAM_VIDEO_PATH);
            Core.Initialize();
            _libVLC = new LibVLC();
            _mediaPlayer = new MediaPlayer(_libVLC);
            _videoView.MediaPlayer = _mediaPlayer;
            var mediaUri = Android.Net.Uri.Parse(this.VideoPath);
            var m = new Media(_libVLC, mediaUri.ToString(), FromType.FromPath);
            var configuration = new MediaConfiguration();
            configuration.EnableHardwareDecoding();


            m.AddOption(":fullscreen");
            m.AddOption(":codec=avcodec");
            m.AddOption(configuration);
            m.AddOption(":file-caching=1500");
            _mediaPlayer.Media = m;
            _videoView.MediaPlayer.Play(m);

it's work fine in first run but if i click on video for second time or open another video it's grey and pixeled