On a related note …
I run Folding At Home overnight, and in the past six months I would check only to find my wifi was disconnected. Frustrating as all get out. Finally, I ran into thread regarding creation of the file wifi-powersave-off under NetworkManager.
I suspect it was a remnant of the above discussion of dual boot, since the trouble did start about the last time I brought up Windows. I further suspect that while folding larger molecules, the wifi would have no transmitting activity long enough to put it into sleep mode.