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.