This could be one or more problems, but first please post in the appropriate section, i.e the help section next time
the problems that might be:
1.Your internet is cutting you out (and the others)
2.A Vip hacker is crashing your games
3.You have a virus
4.Nexon doesn't like you
5.Nexon well you know sucks
FYI this is not a mean comment it is intended to be a nice one