😱 I have the same problem with the game. I can play UT2004 for hours and not have a problem, but HL2 is killing me after about an hour to hour and a half. I think it might be related to flying around in the airboat as well, because I seem to be able to play longer when I'm not in it. I wish it didn't make me want to hurl for playing, because I can't stop playing. 😀