[GAMEPLAY] Total Graphics corruption during gameplay

A few minutes into a Ranked match while Playing Nautilus [Gromp -> Blue Buff were just cleared] the entirety of the game graphics corrupted severely rendering the game nearly unplayable. Random flickering corruption occurred across the entire screen, occasionally correcting itself for a few seconds, and ultimately was forced to re-launch the game.

Steps:

1. Launch a Ranked match (Champion Nautilus was selected)
2. Play for several minutes

**Bug: ** Once, the game graphics corrupted severely.

**Note: **

• The original LoL client had been open consistently for several days and it is possible some of the latest files had not been downloaded
• Unfortunately as it was a ranked match and I had wanted to get back in rapidly I didn't take a screenshot or video of the effect
• After relaunching the client the issue did not reproduce after rejoining the game