Screen Glitching During Games

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I'm not sure what to do about this, if someone could help me I would be so grateful. Whenever I engage the enemy it's almost like a big time lag spike and it lasts for about 3-5 seconds sometimes the screen goes all black and sometimes it even minimizes the game and I'm sitting there looking at my Desktop Icons. As everyone is well aware this makes it impossible to play especially in ranked. I haven't been able to play a fun game now for about 2 months. Does anyone know what is going on and how I can fix it? Thanks everyone
-Lord Mumfordofhosts