Client crashes after a few minutes in game.

This happened to me twice already since the most recent update (8.21). The game will load up just fine but after a few minutes it will just stop crash. Description of crash: 1st. You can hear a windows error sound. 2nd The screen goes black and I can only see the legue cursor on the screen. 3rd The client will not respond whatsoever, the only way to reconnect into the game is to logg off the PC, because Ctrl + Shift + Esc won't work, theres no way of bringing task manager up. This has happened to me twice already and I have only experienced this after the most recent patch. Is anyone else having this issue?? Any solutions?
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