FAQ# 977:

Why does the LS2208´s laser only work for a few seconds then turn off?

Answer

In most cases, this is indicative of the scanner receiving too little power. If it is a non-USB device, it may require a separate power cable. Check the original product listing on our website, or with the product manufacturer to see if you require a separate power cable. If it is a USB device, either the cable or the USB port may be faulty. If the USB cable is plugged into a USB hub, it may not be receiving enough power. For these issues, try plugging the scanner directly into a USB port on the computer, switching the USB port the scanner is plugged in to, or replacing the USB cable.

Rarely, this may be a fault with the scanner itself; it is wise to pursue other solutions before replacing the scanner.