Game Play: Velkoz's E

Somehow since 2 patches ago (when the minions started to freeze in lane along with animation glitches/freezing of Velkoz's tentacles,) I noticed that Velkoz's E randomly does not activate even though you hit E and select a spot to fire. It occurs enough times, maybe 40% of the time, that it is a big issue. I thought maybe the patch did not allow me to combo smoothly like I used to, bursting all 3 spells at once (and 4 if I wanted to ult) and half of the time does not hit my E stun during this combo. But this recent game I just played confirmed it. All I hit was E to stun the enemy for my jg to finish, but I noticed that it did not even fire even though I clicked on intended area to cast upon.

Someone please help address this as Velkoz is one of the champs I frequently rank with.