Shared file or database stopped working? HOSTS may be the quick fix

Did you ever show up one day and one, two or half the computers in the office won’t connect to a share on another computer, server or NAS? Welcome to the wonderful world of technology.
This seems to go in spasms and through different clients. Sometimes it is on a peer-to-peer network, other times it is on a domain. Rarely if ever does it occur on more than one client at a time.
This can happen when backups are to run on an NAS, or to a shared database that has worked fine for years.
What you ten to get is \\sharename not found. Examples are below.

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