Image_Select not saving

I'm having a problem trying to save Image Select. Sometimes it saves , sometimes not.

I'm using this function along with a Jquery that control Sticky Menu

Metabox Function:

    $meta_boxes[] = array(
        'title' => esc_html__( 'Seleccióna Layout',  'dreamstheme' ),
        'id'  => $prefix . 'select-layout',
        'priority' => 'high',
        'autosave' => true,
        'post_types' => array( 'post', 'page'),
        'fields' => array(
            array(
                'id'       => $prefix .'layouts',
                'name'     => esc_html__( 'Layout', 'dreamstheme' ),
                'type'     => 'image_select',
                'options'  => array(
					'front-0' => $location . '/inc/plugins/theme/assets/front-0.jpg',
					'front-2' => $location . '/inc/plugins/theme/assets/front-2.jpg',
					'front-4' => $location . '/inc/plugins/theme/assets/front-4.jpg',
					'front-5' => $location . '/inc/plugins/theme/assets/front-5.jpg'
                ),
            ),

			array(
				'id'   => $prefix .'layout_video_url',
				'name' => esc_html__( 'URL del video', 'dreamstheme' ),
				'type' => 'oembed',
				'title' => esc_html__( 'Seleccióna la URL del video', 'dreamstheme' ),
				'visible' => [$prefix .'layouts', '=', 'front-5']

			),
			array(
				'id'   => $prefix .'layout_video_logo',
				'name' => esc_html__( 'Imagen de los logos (384px  x  216px)', 'dreamstheme' ),
				'type' => 'image_advanced',
				'title' => esc_html__( 'Seleccióna  la imagen de los logos', 'dreamstheme' ),
				'max_file_uploads' => 1,
				'visible' => [$prefix .'layouts', '=', 'front-5']

			),
			array(
				'id'   => $prefix .'layout_video_background',
				'name' => esc_html__( 'Imagen de fondo', 'dreamstheme' ),
				'type' => 'image_advanced',
				'title' => esc_html__( 'Seleccióna la imagen de fondo', 'dreamstheme' ),
				'max_file_uploads' => 1,
				'visible' => [$prefix .'layouts', '=', 'front-5']

			),
			array(
				'id'   => $prefix .'layout_fixed_background',
				'name' => esc_html__( 'Posición de la imagen de fondo', 'dreamstheme' ),
				'type' => 'radio',
				'title' => esc_html__( 'Seleccióna la imagen de fondo', 'dreamstheme' ),
				'options' => array(
					'nofixed' => 'No Fijo',
					'fixed' => 'Fijo'
				),
				'visible' => [$prefix .'layouts', '=', 'front-5']

			),
			array(
				'id'   => $prefix .'layout_links_go',
				'name' => esc_html__( 'Link general de pauta ', 'dreamstheme'),
				'type' => 'url',
				'title' => esc_html__( 'Escribe el link al que va dirgida esta pauta', 'dreamstheme' ),
				'visible' => [$prefix .'layouts', '=', 'front-5']

			),

        ),

    );

jQuery Functions:

    jQuery(document).ready(function($) {

    $('input[value^="front-"]').click(function(){

        if($(this).is(':checked')){
            $('input[type=checkbox]#sticky').prop('checked',true);
        } else {
            $('input[type=checkbox]#sticky').prop('checked',false);
        }
        showOrHideDenUrl(this.value);
    });

    layout = $('input[name="den_layouts"][checked="checked"]');
    if(layout[0]) {
        showOrHideDenUrl(layout[0].value);
    }

    function showOrHideDenUrl(value) {
        if(value === 'front-0') {
            $('input[type=checkbox]#sticky').prop('checked',false);
        }
    }

    $break_new_checkbox = $('#den_break_new');

    if($break_new_checkbox[0]) {

        set_imge_color($break_new_checkbox[0].checked);

        $break_new_checkbox.click(function(){
            set_imge_color(this.checked);
        });

        function set_imge_color(is_active) {
            isMobile = $('#den_break_mobile')[0];

            if(is_active) {
                $('label[for="den_break_new"]')
                    .css("filter", "grayscale(0%)")
                    .css("opacity", "1.0");

                if(isMobile) {
                    isMobile.disabled = false;
                }
            } else {
                $('label[for="den_break_new"]')
                    .css("filter", "grayscale(100%)")
                    .css("opacity", "0.3");

                if(isMobile) {
                    isMobile.checked = false;
                    isMobile.disabled = true;
                }
            }
            $('label[for="den_break_new"]').show();
        }

    }

    $sidebar_checkbox = $('#den_sidebarCheck');

    if($sidebar_checkbox[0]) {

        set_imge_color($sidebar_checkbox[0].checked);

        $sidebar_checkbox.click(function(){
            set_imge_color(this.checked);
        });

        function set_imge_color(is_active) {

            if(is_active) {
                $('label[for="den_sidebarCheck"]')
                    .css("filter", "grayscale(0%)")
                    .css("opacity", "1.0");
            } else {
                $('label[for="den_sidebarCheck"]')
                    .css("filter", "grayscale(100%)")
                    .css("opacity", "0.3");
            }
            $('label[for="den_sidebarCheck"]').show();
        }

    }

});

What do you think? , why my image_select metabox are not saving?