skill interruption other than stun/freeze?

My cyclone keeps getting interrupted for a rather long time, yet I am stun immune and 100% sure it's not freeze.

What else causes long stun-like effects during regular mapping?

It's happening a LOT.

Are you running out of mana?

"

Are you running out of mana?

I'm guessing it's this as well. If not, I have noticed cyclone seem to be a bit buggy at times. Can't explain it exactly but on certain builds it sometimes seems to stutter. I was finding that it would stop spinning for a split second even when no mobs were around and on full mana. It's possible that this had something to do with my mouse and not the game, so that's something else to check.