Champ Select/Rune Editting bug

My game has been crashing in champ select. It happens pretty often and especially when I'm editting runes and try to save. The client stops responding and i have to close it using task manager. I have to manually stop the process in task manager as well or the game won't restart at all. I've lost some LP due to this bug and wasn't able to get the right runes and masteries because it wouldn't let me save.