NAS dropped off of Windows 10 Explorer on several network attached computers?

[WilR]

Without any significant changes to the network or any computer, my NAS drive, admittedly an older Lacie NetworkspaceMax, suddenly stopped showing up on 3 of my 4 networked computers. Have searched for a solution and tried several fixes without getting them back. This problem remains unresolved. Would appreciate any help.

[Grra]

Is there a difference how you set up the share on your computers?

I can think that if you set up the share using the name of the NAS on the computer that works and;
set up the NAS using IP numbers on the computer that does not work would show the scenario you are describing if the NAS got a new IP number via DHCP.

Then the computer that is looking for the NAS name will find it but the computers looking for the IP address that the NAS had before will not find the new IP.

Have you checked this?