Problem with download of big files using WinCP

Hello !
First of all - I'm still not 100% sure the problem relates to WinCP.
I use on server side - Centos 6.5 with standard SSH service.
I use on home PC - Windows 7
I use WinCP 5.5.1 version
Download on background.
All WinCP settings - default.

The story is - when I try to download a big file through WinCP (size 1-2 GB) - after a 3-5 minutes it stops and hungs to a dead.
No reaction to CANCEL or SUSPEND on Download Queue.
No tries to reconnect with server (if a connection is lost on background)
Only Ctrl-Esc on Windows with Kill Service can help - because even after F10 exit from WinCP - it's still running.

I have two ideas in my mind what could cause this problem.

1) Something is wrong with SSH settings on server side - this case I would be EXTREMELY obliged for a right example of SSHD config file - I'll make some tests with the one.

2) Something is wrong with WinCP - because it actually loses a feedback and even does not try to reconnect with server/resume download (as said above - only KILL SERVICE on Windows 7 helps)

Thanks in advance for any hint !
Best regards
Serge

Please attach a full log file showing the problem (using the latest version of WinSCP).