Game freeze, hear windows sound

Hello I'm having an issue where my game suddenly freezes, i hear the windows "warning" sound, and i try to alt+tab to open task manager. I cant open task manager, so i have to force log-off. Happends every 10th game or so. Does anyone have a fix? This game i just struggled to get it fixed, tried to rejoin twice, but it would'nt let me, when i finally got in, we won a teamfight, and then won the game, and i lose 16LP cuz i was stamped a "leaver" like wtf is that...
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