SCP and SFTP dropping connections

I'm trying to send and recieve files of over 400MB (archive data - sometimes over 2GB) to/from my computer (with static IP).
I find that after about 300 MB the connection (whether it is to/from) starts to slow down, then stalls, then timeouts stopping the transfer. I've tried the following clients: scp (command line & fugu), sftp (command line & fugu, cyberduck and transmit). I even tried FTP (same methods) and it failed at the same point.
The problem is only 1 machine. I spoke to my ISP and they checked over my modem and confirmed it not to be the problem. They said it was most likely a setting on the machine in question, but I have no idea what setting.
Can anyone point me in the right direction as to where I can alter this? I just want a stable connection.

have a look at this bug:CSCsj53216

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