Client crashes with windows sound

I have this problem for some weeks now. Every like 1/10 games or so my client just freezes in game. It is always this windows 10 error sound: and immediately afterwards the client is non responsive. The main lol program (with chats etc) is still working. I can then shut down the client via task manager and reconnect. This has cost me some games already. Anyone know what could cause the problem, because I have no clue whatsoever? Do you need more info from me?
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