Game doesn't load after champ select [Crash]

This has happened multiple times. I will go through champ select and everything will be fine and then after champ select the client will tell me that there was a problem loading the game and it wont come up. I can hear all the games sounds but nothing will be on the screen and I won't actually be able to play. I tried closing the client and reopening it and also restarting my computer and nothing works. This is a serious problem and it has caused me to lose a lot of lp when its not even my fault. I won't be playing again until there is an update where this is fixed.