samba - Nov 2019 - Subject=Re: Mac Clients Disconnect with: source3/smbd/service.c:1050(close_cnum) closed connection to service data

Maybe?but on the link he provided to apple.stackexchange he said he was running
Samba on Ubuntu servers and it appeared the issue was the Macs disconnecting
from the Ubuntu servers?
I was suggesting he run testparm on those servers.

OP did not post a full smb.conf, but one showed the vfs objects in a [data]
share, but various fruit: parameters in the [global] thus my ?assumption?
(really a question ;-)