CONSTANT Crashing!

I'm VERY upset with how this game is running right now! I have been playing since KogMaw came out, and this is the first time I have ever experienced such egregious issues with this game!

While using Discord with friends, randomly the game will either:

-Bug splat -Crash my entire computer

The later is VERY frustrating as there is no action to take other than restarting the whole computer! I thought it was the overlay from Discord, but given the fact that it's almost like a roll of the dice for when the crash happens, I cannot say for sure!

The reason I am upset is that now, for quite literally the first time EVER, leaverbuster has warned me! I really want this reverted, I have tried for YEARS to follow the summoners code to a T.

I am running on Windows 8.1, I have an Intel i7 with 9 (yes, 9. No, I am not sure either. Was a hand-me-down computer) GB of RAM. I am using a card that only allows DirectX 11, would this cause issues?

I understand I may seem angry, but I am quite upset that there is some shortcoming in the application that is causing this sporadic issue which has now affected on my status as a player.