Hi everyone! I'm new in here, so please be patient

. When I play Zombie Panic, time 2 time the mouse sensibility turns very high. So when I move mouse, for example, to turn back, the player twists on him self about 2 and a half rounds. It takes about 5 seconds of high sensibility and then becomes normal. Please, it's VERY disgusting... Hope you can find out what could the problem be... Regards!