Can you fix your garbage freezing game, riot?

Every game, no matter the game type, my game freezes at around the 18-20 minute mark. There's no reason for it to do this, No other game freezes or stops working out of no where. League is the only game that does this. My buddy that lives right down the road also experienced this the other day. Every time it freezes I can't ALT TAB out or change windows, I have to reset my computer or sign out. And sometimes the game doesn't want to load and it will sit in the little league of legends icon in the middle of the screen... I've reported this bug and over 2 weeks ago and still nothing.. DO SOMETHING RIOT. You're costing me games.. And before you say have you tried re downloading it? Yes, several times, and tried patch repair bs. Just fix your game.. Its been doing this for the past 2 months maybe even longer..