I have a similar problem, but sometimes it happens before i even start playing. If i sit on the main menu for a little while, the music gets wierd, and when i try to get onto another screen (config, ia, training, etc.) everything runs really slow. It sometimes happens right away, even if i don't wait around for the music to get screwed up. When i exit the game, my computer even runs slow, like if i right-click on the desktop, the menu that comes up moves very slow. The same thing happens with minimizing and maximizing the windows. So far, he only way i have found to fix it is to reboot.