Drive Becomes Un-Accessible After short use

I am including a link to another post you might want to review.  I don’t know if this will help those here but it worked for me and I have a WBEII WL with the same issues discussed in this thread.  I didn’t want to cross-post but the idea is to change the NIC configuration and doing this allowed me to copy 61gb in a 90 min window w/o a lockup.  Before the NIC config change the copy process was often unstable and usually required a power recycle to see the NAS again.

http://community.wdc.com/t5/My-Book-World-Edition/Network-connection-problems-when-uploading-large-files-to-USB/m-p/28887#M1269