Copying problems. Error Ex8007003B: An unexpected network error occured

Greetings

I get error Ex8007003B while copying to WD My Cloud EX4 network attached storage.
Copying speed drops to 0 bytes/s and then i have to click Try Again.

Any advice?

Hi, what operating system you have installed in your computer? How are you connected on the network? Did you receive this error message in an application?