my pc freezes after a few seconds ingame

i tried to play yesterday and this bug happened, and i turned off my pc and turned it on again tried again, same happened i accepted the loss and my friend told me that they won the game somehow. today i went into a battle training game before to test if it worked it worked fine went into a game and this happened again, FYI twitch was in both games

this was ranked solo/duo, FYI twitch was in both games and i'm using a lenovo y50-70 can run every other game just fine but not league