If you experience the following problem with either E4200v2 or EA4500 router from Linksys, you may want to apply the latest firmware (Ver.2.1.41.162351 released on July 31, 2014) from Linksys support site. The specific problem is annoying and sometimes critical if you don’t have a proper backup strategy in place. Media files on the external drive attached to the USB port of the router will be converted to folders on a random basis. Once turned to folders, it will be difficult, if at all possible, for these files to be accessible again. In other words, they are lost.