几次尝试后，Xampp无法识别VirtualHost？

Question

几年前我安装了xampp。但是现在我对vhost的配置有点问题。

我的服务器中有4个不同的页面，apache正在运行端口80.所以我对vhost的配置如下：

NameVirtualHost *:80

<VirtualHost *:80>
    DocumentRoot "C:/xampp/htdocs"
    ServerName localhost
  </VirtualHost>

<VirtualHost *:80>
    DocumentRoot C:/xampp/htdocs/paginasweb/munkys
    ServerName www.munkys.com.co
     <Directory "C:/xampp/htdocs/paginasweb/munkys">
      Options Indexes FollowSymLinks Includes ExecCGI
      AllowOverride All
      Require all granted
      Allow from all
     </Directory>
</VirtualHost>

<VirtualHost *:80>
    DocumentRoot C:/xampp/htdocs/paginasweb/flinda
    ServerName www.flinda.com.co
     <Directory "C:/xampp/htdocs/paginasweb/flinda">
      Options Indexes FollowSymLinks Includes ExecCGI
      AllowOverride All
      Require all granted
      Allow from all
     </Directory>
</VirtualHost>

<VirtualHost *:80>
    DocumentRoot C:/xampp/htdocs/paginasweb/pluxpc
    ServerName www.pluxpc.com.co
     <Directory "C:/xampp/htdocs/paginasweb/pluxpc">
      Options Indexes FollowSymLinks Includes ExecCGI
      AllowOverride All
      Require all granted
      Allow from all
     </Directory>
</VirtualHost>

<VirtualHost *:80>
    DocumentRoot C:/xampp/htdocs/paginasweb/conradoarte
    ServerName www.conrado-arte.com.co
     <Directory "C:/xampp/htdocs/paginasweb/conradoarte">
      Options Indexes FollowSymLinks Includes ExecCGI
      AllowOverride All
      Require all granted
      Allow from all
     </Directory>
</VirtualHost>

我的问题如下：

当我尝试加入我的网站www.conradoarte.com.co时，该页面正在本地网络外部加载，但几分钟后或尝试dns丢失，但如果我加入本地网站内网络页面已启动。从本地网络重新加载页面后，我可以再次看到本地网络外的页面。

我不知道真正的问题是什么。