[GAMEPLAY] Darius randomly stops autoattacking during combat

I just finished a horrible twisted treeline game because of this bug and I had to come here to the boards to mention about it incase, so riot is atleast aware of it if they weren't already?

So, the bug was preventing Darius autoattacking in the middle of fight, while I was trying to "right-click-autoattack" with mouse on opponent champions. This happened randomly, I believe, since I did not have time to make logical points/notices during the fight, what was causing the bug. The bug however was gone afterwards when I was autoattacking minions all casual and normally, but whenever the fight started between the champions and I was doing my best trying to autoattack enemy champions, instead Darius was only just wandering around and his figure was surrounded by green shining? Only the skills were registered to hit on champions. I read somewhere in internet that possibly his "E" can cause this, after succesfully gripping a champion?

I was using "Dunkmaster" skin during this game, but some few days earlier I didn't experience the problem with Darius, even though I was using the same skin too.

Hopefully this gets resolved asap, cheers!