[CRASH] Game Doesn't Start, Claims DirectX is Out of Date

This only happened once to me, just now (7/10/15, ~2:20 PM), but it kept me from joining the game for a solid eight minutes. I went through champ select as usual, and when everyone was locked in the client tried to boot up the loading screen as it always does. However, the game appeared to try to window itself, and then claimed that I couldn't join the game due to issues with my graphics card and/or DirectX, and recommended I update my drivers. I checked my drivers and such and everything seemed up-to-date, which wasn't surprising considering I'd already played a couple games today. I tried closing the client and re-logging, but the problem persisted until it inexplicably decided to fix itself. I was playing Mundo, and the full teams were:

Dr. Mundo, Tahm Kench, Diana, Kalista, and Thresh Tryndamere, Udyr, Swain, Jinx, and Annie.

I have an AMD Radeon HD 6800 series graphics card, and am running DirectX 11.

This doesn't seem to be a very prevalent problem, but hopefully this will help fix it before it becomes more common.