I've got a WRT600N using WPA-2 Personal on the 5Ghz channel. Whenever I try to upload something from my machine to a NAS attached by ethernet to the device I lose the wireless connection. This doesn't happen if I turn encryption off, or if I'm uploading to something on the Net, only a device connected via ethernet. It doesn't matter whether I use zero config or Intel Proset. The same problem happens with every variation of WPA. It's fine if I connect to the 2.4Ghz channel. I've upgraded to the lastest firmware for the router and NAS as well as the latest driver for the intel wireless card. I'm using all the default settings on all the devices. Does anyone have any ideas why this might be happening with WPA, other settings I could try, anything that might help.