Game freezes and computer has restart problems afterwards

Version: 9.7 (10-14.04.2019) Server: EUW Type: Client Details: While beeing ingame the game randomly freezes and beforehand doesnt accept inputs from the keybaord anymore. When restarting the computer afterwards it either has restart issues or trouble getting mouse or Keyboard inputs. This bug happend both on my system and that of a friend so it shouldn't be related to the PC's since they dont share any components.
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