Suddenly can't access shared drives on LAN but can access shared folders

This just happened this past week.  Prior to last Monday everything had been working fine for over a year.  Here's the scenario:
I have a LAN with a Tower Computer, a Desktop and a Laptop.  The tower computer has two external 2-bay cabinets connected via e-SATA.  One cabinet has two drives configured as Raid 1 (i.e. 1 mirrored logical drive and has the 'shared
name' "Raid1-Array and the drive letter of Z: ), which is a repository for data that must be available to all computers on the LAN.  The other cabinet has two individual drives used for backup (stored offsite and only installed once
a week).  One of the latter is for backup of the "local" Tower (Drive G: - not shared), and the other is shared for LAN backup of the Laptop ('shared name' "LT-Backup" and Drive F:).
Suddenly this week, the laptop can no longer access the shared repository (Z:) nor its shared backup drive (F:) on the Tower.  As a temporary solution for the backup, I shared the laptop's backup folders of F:, and
for some unknown reason the laptop can access those, but not the F: drive itself.  When I try to access Z: or F: using File Explorer I get an error message saying:
"Windows cannot access \\TOWER-755\LT-Backup  You do not have permission to access
\\TOWER-755\LT-Backup.  Contact your network administrator to request access"
All of the computers are in the same "WORKGROUP" and the same "HomeGroup", and I've gone through all the Help & Support texts and have run every diagnostic that I could find, but all to no avail.
Another creepy thing is that the desktop (the third computer on the LAN/WORKGROUP/HomeGroup) CAN access the drives, but that computer is only here temporarily while I'm working on it.  In light of this I'm assuming that the problem lies with the
Laptop, but for the life of me I can't figure out what/how.
I'd be very grateful for any/all help to resolve this mystery.
Capt. Dinosaur

any changes before this issue happen? any other device connected and facing same issue
did you check folder share permission setting?
how about you re-edit the setting for user name password

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