The game works fine on my computers for several days until yesterday I found that it will freeze randomly while I playing, the sound is normal, just the screen will freeze and I cannot do anything, if I switch to another window, the screen will resume and the game looks like fine at background, but when I switch it back, the freeze appears once again and again and again and occurs so frequently (less than 30 sec) that I cannot play it anymore, I tried to reinstall it and doesn't work, after...

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