I know this is an old thread but I had the same problem as well, however after switching the adapter to a different USB port, it worked just fine.Hey
I got this stick too. But my connection is really slow. I don't get the 300Mbit.. It is not about the distance because i tried a notebook in the same place. The speed was at the highest.
Wondering if it is for you also that slow? I just get 30% of what should be possible.