Paul
Go into Local Area Connection applet "Properties" > "Internet Protocol Version 4 (TCP/IP) > "Properties" > "Advanced" > "WINS" and set the radio button to what is "NetBIOS over LAN" as shown in the attached image.
Have found that this setting (though deemed to be "insecure" but you're in the home environment and your router firewall should be adequate) has resolved many times for me the very phenomenon you are experiencing.
Of course ensure that all PCs are on the same workgroup plus the network location is either "Home" or "Private" and NOT "Public"
HTH
Cheers
Bill
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