Script fails during run

I have a script that runs every day at midnight, now I am getting the below error in my logs. Does anyone know what the cause can be?

. 2014-08-28 00:03:22.211 Retrieving directory listing...
> 2014-08-28 00:03:22.211 CWD /HomeFolder/Brent/Documents/a la mode/Database/Images/8b/
< 2014-08-28 00:03:22.221 250 CWD command successful.
> 2014-08-28 00:03:22.221 PWD
< 2014-08-28 00:03:22.241 257 "/HomeFolder/Brent/Documents/a la mode/Database/Images/8b" is current directory.
> 2014-08-28 00:03:22.241 TYPE A
< 2014-08-28 00:03:22.251 200 Type set to A.
> 2014-08-28 00:03:22.251 PASV
< 2014-08-28 00:03:22.261 227 Entering Passive Mode (204,80,91,145,251,94).
> 2014-08-28 00:03:22.261 LIST -a
< 2014-08-28 00:03:22.281 150 Opening ASCII mode data connection.
< 2014-08-28 00:03:22.291 226 Transfer complete.
. 2014-08-28 00:03:37.011 Timeout detected.
. 2014-08-28 00:03:37.011 Could not retrieve directory listing
< 2014-08-28 00:03:37.011 Script: Lost connection.
< 2014-08-28 00:03:37.011 Script: Timeout detected.

< 2014-08-28 00:03:37.011 Could not retrieve directory listing

< 2014-08-28 00:03:37.011 Error listing directory '/HomeFolder/Brent/Documents/a la mode/Database/Images/8b'.

Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.

Got it. It seems the error is inconsistent but I will try what you gave me and report back.

martin wrote:

Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.

I tried out the debug build, I still get the lost connection error after about 30 minutes. I am post what my script options are at the moment.

option batch abort
option confirm off
open ftp://ftpbackup:%1%@server.com
synchronize local g:\appraise /appraise
synchronize local g:\Documents /Documents
synchronize local g:\ftproot /ftproot
synchronize local g:\HomeFolder /HomeFolder
synchronize local g:\Quickbooks /Quickbooks
synchronize local g:\Share /Share
synchronize local g:\Software /Software