I also got this problem: When transfering large amounts of data over the network the network card would disconnect, requiring a "disable/enable" to fix.
I am running Windows 7 64 bit RTM and the latest Atheros
driver (2.4.7.27).
To resolve, I went into the
driver properties, clicked Advanced / Task Offload, and I turned this feature off.
Now, the
driver works fine for me