Those of you who still have this problem, try the following:
in the Registration Key [HKEY_CURRENT_USER\Network\*SMBv1 Drive Letter*], create the Value REG_DWORD
"ProviderFlags" decimal 1 (0x00000001)
This should make it possible to communicate properly with the network drive at startup and shutdown. Do the process for all those units you have with smbv1 connection
Does this fix work for remote users that connect to the network via VPN? I worry that based on your wording "communicate properly with the network drive at startup and shutdown" means that it will only work if they're already on the network at startup, instead
of having to connect a vpn after booting up.