This could be due to network issues on your end or because of inactivity. Inactivity may be caused by pausing the video stream for an extended period of time or by the computer entering into sleep mode and canceling any current network activity. Close the browser and log back into the site. If you continue to have issues, we can mail you copies of the DVDs. Please contact us at (512) 427-1477 or email us at firstname.lastname@example.org.