[Gameplay] Draven Q causes the game to stumble.

When doing an auto-attack with Draven empowered by his Q the game kind of stumbles. Just like when a disconnect begins to occur. The bug isn't occuring all the time, but usually it occurs for several seconds after every auto-attack. We first encountered this bug, when one of my friends picked him in a normal game.(Draft Pick, all premade) He tried to reconnect but the bug kept occuring. The next I played Draven myself and experienced the exact same problem. Our Pings stayed at all times at normal 30 - 50 ms.

After that when i wanted to record a video for this bug report i jumped into a 1 v 1 custom game. Strangely the bug only occured rarely and for short periods of times. I'm currently trying to reproduce the bug to record a video of it.

I'm using an NVIDEA GeForce GTX 660 and an Intel i5-3550 3.3GHz. My Friend is using an AMD Sapphire Radeon r9 380 Nitro OC and an Intel I5-4460 3.2GHz. We both have been playing League of Legends for almost 4 years without ever experiencing performance issues that weren't connected to a bug or sth alike.