samba - Dec 2019 - smbclient parallel_read returned NT_STATUS_IO_TIMEOUT

Trying to copy a large file from a Windows 10 box

Using smbclient - like so.
smbclient -U administrator%somepass //10.1.2.3/temp
prompt
recurse
mget *


mget starts, but then fails with the following details.
---
parallel_read returned NT_STATUS_IO_TIMEOUT
NT_STATUS_CONNECTION_DISCONNECTED opening remote file \abc.txt
NT_STATUS_CONNECTION_DISCONNECTED listing \*
smb: \> getting file \20191230-153202-def.7z of size 1607546951 as
20191230-153202-def.7z SMBecho failed (NT_STATUS_CONNECTION_DISCONNECTED). The
connection is disconnected now

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The problem version of smbclient is:
# smbclient --version
Version 4.9.15

---
Google finds very little and nothing that was helpful.

Tried limiting protocol to smb2, nada.
Saw some reports of: --socket-options='TCP_NODELAY IPTOS_LOWDELAY
SO_KEEPALIVE' and with 'SO_RCVBUF=131072 SO_SNDBUF=131072", nada.
Probably a few other things I've tried, but can't recall now.

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The file being copied is about 1.6G in size.
The failure occurs after pretty close to 100 seconds. [1m 40s]

I've tested coping the same files using the same credentials to a native
Windows client - works fine.
Tested using a Ubuntu 16.04 smbclient same details, and it works fine. [Version
4.3.11-Ubuntu]

The host/cifs-server is Windows 10

It doesn't help that I know almost nothing about smbclient - so take it easy
with the rack, hot tar, chains, and other torture implements, ok?
:)

Suggestions?

TIA