Cant access music drive from Windows

My LMS server runs on a Pi 4 running Picoreplayer. The music is on a 2Tb
USB drive attached to the Pi. Ive added the Samba extension to share the
music drive, with my Windows PCs. This has worked well for a few years
now, but a few months ago, one of my Windows laptops lost access to the
shared drive, and I cannot persuade it to reconnect. This is not a
Picoreplayer problem, because another Windows laptop still sees the
shared drive and can access it fine. I also have a few other Pis running
Open Media Vault, Home Assistant, OSMC etc, with attached drives, and
again 1 laptop can see and map all the shared drives, but the other (my
main PC) can't.

Both PCs are running Windows 10 and both are updated to the latest
version.
The problem means I cant manage my music library (or videos etc) from my
main PC

I haven't made any intentional changes that would have affected the
network or the problematic PC, but clearly something is wrong. I've done
lots of googling on "Windows cant map Network drive", and tried all the
suggestions, but no joy so far.

Does anyone have any ideas what might be wrong and how to diagnose?
Thanks



Lounge: Transporter -> Cyrus Linkpower x 3 -> PMC OB1i
Bedroom: Classic -> Cyrus Linkpower -> B&W VM1
Kitchen:     Classic -> Denon AVR-x2200W -> Mission 753
Gym:      Picoreplayer/IQAudio Dac/Touch screen -> Cyrus 8 & PSX-R - Kef
Reference 104/2
Office :    PC Squeezelite-X -> Cyrus III -> Linn Kan
Garage:   Boom
Server:      Raspberry Pi4 8GB, Picoreplayer LMS 8.0.0
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