Error transferring files

When I want to transfer a file, the program will eventually give this error:

150 Opening BINARY mode data connection for 2004-5.htm
964 bytes transferred. (31,3 kB/s) (30 ms)
Timeout (20s).
Active Help:
Client closed the connection.
Transfer failed.

I have to click on another directory or reconnect. The file is on the internet, but with each file it happens again and I have to reconnect again. It happens also when I want to transfer multiple files or a directory.

Who can help me?

It seems the connection got lost while transferring the file. Use the global queue for all transfers to avoid this. The queue will automatically reconnect and resume when interrupted until the file is successfully downloaded.