Help Rito Pls (mac crash)

Hello! Thanks for reading this whoever you are. This is my first post on here, I am taking the time to write this out because it is very important and I think other mac users are having the same problem. Every time (literally every single time) I attempt to play a game this happens. I enter champion select, no matter what game mode, I am able to select a champion and lock in.

When the timer counts down, the sound that plays usually when the game starts and the champ select window closes, does not play, and the window will freeze in that spot and I will have to force quit the application and relaunch League. At this point I can rejoin the game after I open the launcher and log in, but by this time the game has already started and everyone is about level 3 or 4. Do you guys have any advice on how to fix this or if this a common problem? Thanks in advance- Riley