Go into WoW.
Right click 'general' on the chatbox tab.
Untick 'Battlenet whispers'.
This fixed it for me atleast. I was getting a WoW error every 3-4 minutes. I tried to disable all my addons, to clear my cache, everything. But as soon as I turned my Battlenet chat off I have been fine.
Give it a try, and I hope it helps :)