Highly frustrating bug on the new MacBook Pro

Hi, so I bought the new MacBook Pro and at first everything was fine exept that if I alt tab at any time during a game, my game would freeze when I went back in it. So I would have to restart reconnect and reconnect. But this past week, something highly frustrating is happening that is ruining my gameplay. Randomly, my game will freeze, but not completely. It will be stuck on the image of when the bug started. but I will still hear the sounds and I'll still be able to move if I click somewhere on my map. To get that fixed, I have to alt tab and then click back on the game. But for some reason it doesn't do the first glitch I used to have when alt tabbing (just adding details). Anyway, that bug will occur like 10times each game it is so annoying. I'm sure you can understand how that decreases my gaming performance... So for exemple, last game as I'm writing this, I was about to kill the lux, I flashed on her and bam. The bug happens and the image gets stuck so quickly I alt tab and try to get back into the game but It's too late..she killed me. So yeah... can happen during team fights too. My fps averages 135 but varies a lot during the game. Any suggestions to what I should do? Please.. can support help me or should I ask on here?? I dont know but help...