When i play TF2 my Macbook air freezes from 15minutes to 1 hour of being in game. the frame freezes as it is and my computer wont respond. I cant alt tab out, Do any shortcut such as turn up brightness or play music. My computer just stops, forcing me to hold down the turn off button and restart.It does it when i'm not even in a server. also when i'm playing offline it also happens??? Any suggestions?
P.S. This was happening before the new horrible tf2 update