Random game freezes

Hello there, lately my game has been freezing randomly and the only way to get it to unfreeze is to restart my computer, my computer is alright and runs league really smoothly apart from that freeze thing that usually happens on my second game of the day. It's pretty annoying since it happens maybe 3 mins into the game and after it happens I have to restart my pc and when I come back to the game I'm obviously really behind and end up losing the lane and being weak af.

Any tips on how to solve this if there is any fix? [sg-soraka]