[Gameplay]Force locking camera causes framedrop/freezes for a 3 second duration

I believe I've found an issue relating to holding down spacebar to lock your camera.

With about a 50% success rate, I've found that holding space during the following was causing my screen to freeze, as well as sound effects to loop:

*Champion Death(Either Team)(On or off Screen)

*Leona Ultimate

*Kallista E

*Nexus tower explosion

Over several games, these are the only effects causing the freezing issue, and it happened only when I held down spacebar. I've got a GTX 660, running 2 monitors, and have league at max graphics settings on Windows 7.