I'm using an RPi 3B+ with a fresh install of Raspbian from noobs. It has Samba installed and also OpenVPN, VNC, SSH and Transmission. When I try to copy a series of larger files to my Windows 10 computer, the copy usually fails after a couple of GB has been copied. The error is "An unexpected error is keeping you from copying the file". The file is 8.7GB in size. A reboot clears the network problem, and smaller files copy just fine.
The network is wired ethernet via a Netgear switch for both RPi and desktop hardware.