I had this problem in January but it seemed like it was fixed at some point.

My computer is not overclocked.

It really only occured when I equipped the ability "Axemanship". My abilities would be "ready" 2-3 seconds before they were useable again... was annoying hitting the buttons for 4 seconds to get the ability to work since it wasn't actually done cooling.

Maybe their fix for the original issue is now causing problems with OC'd computers?