Continously losing the game

Hi,

Why is it nearly every 2 days I have to uninstall and reinstall the game because the game comes up with that stupid 'Z' and a bunch of numbers message? During loading it happened, so I guessed it was cos I turned the specs too high for my computer but sometimes it just happens its really grinding my gears as to why my games disappears, and when it comes back the map is the silly river map of Berlin.