I have a client with Windows Server Essentials 2016 server. Its managing DNS but not DHCP. All the clients are Windows 7 64 Pro PC. I have one PC that keeps dropping the mapped drives. Ex middle of the day they disconnect.
I tried a variety of remedies including changing the network cable, changing where the Win7 computer is connected (different wall data port). Updating NIC firmware (as well as BIOS & Chipset). I even wiped/re-installed Windows 7.
Note: I have DNS on the Win7 machine set to the IP of the server.