[GAMEPLAY] Syndra 'W' is doesn't activate 100% of the time

I bought Syndra a few days ago, and I've pretty much played her every game since that day. In her W's description, it states that if an enemy minion/neutral monster is not selected, it will pick up the nearest dark sphere. Many times, I've tried to use my W to harrass the enemy in a Q+W+Q combo, but it breaks at the W. The ball appears, but the W refuses to pick it up, even after mashing W, it doesn't pick up the ball. (I know I am in range of the ball, I keep range indicators on) Also, the W will sometimes pick up a ball, even though I'm hovering over a minion. I know that you can no longer insta-throw the minon/ball, but I'm not picking the ball/minion up in the first place. I really doubt it's lag, i have an 84 ping, which is not that bad, and 60 FPS.

Not many people play her, but it is really annoying when u miss CS, a kill, a potential kill, etc...