Hi, if possible try using another Ethernet cable, the My Book Live front light will blink Green when it is being accessed by a program or device on your network, or when the My Book is indexing the files. You can try setting a static IP address for the My Book to see if that helps make the connection more stable. Check page 64 of the manual for more information.
http://www.wdc.com/wdproducts/library/UM/ENG/4779-705065.pdf#page=70
