I'd love to say that its keyclone or a setting that is causing the problem but I think I am having the same type of problem described in the following post:

http://forums.worldofwarcraft.com/th...68277969&sid=1

My problem isn't quite the same (As I don't get the FPS drop) however I do get the stutter but its not consistent at all. Sometimes its every 15 seconds other times its not for 5 mins. This is why I lose follow way more then I ever should.

The only reason that I know its not anything related to boxing is because I get this "stutter" when soloing as well. Doesn't matter if my settings are low/high, game is windowed or maxed.

I don't see any CPU spikes and the temperatures of CPU/Graphics Card, etc are all good