Clarion bugged?

Hi folks, having a somewhat reoccurring problem here, which is quite annoying..

I have Clarion Partial Core Invocation (120s recharge, 120s duration, so its one of the perma ones)

Every once in awhile the power will fire off, but nothing will happen. No graphics or casting animations, the buff doesn't kick in, but the power was used and starts to recharge.. Leaving me with 2 minutes before I can fire it off again.. (which can leave me dead in the water in certain missions like Carnies, if I'm short on BFs)

This seems to happen most often when Clarion wears off while I'm under a previously casted mez, and it attempts to recast itself (I have it on auto)

Under normal circumstances I would be mezed for a second or two, until the recast is complete, then go on my merry way. But now it frequently bugs out and the buff is completely wasted.

It's happened to me in 3 consecutive missions (Freaks, Rikti, Carnies), so something seems to be out of order..

Anyone else having similar problems?