Continued network issue causing hiccup with a software, can you help me do a reset?

Sorry for the lame title, hopefully you guys can help. A client of mine uses software QB Premier 16 Pro on 3 workstations and 1 "pc as a server". I am constantly deployed to fix qb/networking issues.

Resolutions provided by QB work for a day or two and then the issue comes back.

They are using a Nighthawk router, Windows 10 on all ws. Not ideal but it's what it is.

The server pc is reachable via //server but it is never populating in Network Explorer.

How do I got about an entire reset of the network so that Windows and thus QB will be on an entirely new relationship?

Sorry, I can run fiber drops and drop cat6a racks in place all day but this damn windows networking has me stumped.

Any pointing in the right direction would be helpful.

Thanks