Comment 7 for bug 539794

Hi there,
  some more info -

googling around I found this thread
https://bugzilla.kernel.org/show_bug.cgi?id=13362

seems there is indeed a kernel issue here with a possible kernel fix

I've also tried sudo iwconfig wlan0 rate 48M - followed by a reset of my wireless connection. This fixes the problem briefly (approx 30 seconds) before the connection rate slows again.