I've have mentioned this before but the idea is either so far fetched that it didn't deserve a response or a D-Link engineer has not read it so I will repeat it here.
When I ran Netmon to see what was happening while my imaging software was writing to my powered, USB drive, the vast majority of events reported were requests to various TCP ports. When the connection began to fail I started receiving requests to various UDP ports and they were from the router DNS. From what I could decipher, the router was attempting to talk to my computer in the way of querying who was on the other end. Each request ended with a message to the effect that there was something wrong with the name of the computer on the other end. After receiving several of these messages the backup process would freeze which, of course, meant the connection had been severed. Perhaps the UDP requests were coming because the connection had already been severed. Kind of like a "Hey, you still there?". Or, it means something else, or nothing, or I should stick to non-technical work and let the experts do their job. Anyway, if any D-Link engineer would care to chime in and tell me to either get lost or, if I make you scratch your chin and say "hmmmm", then my job here is done.