"You have been disconnected for the HACK reason."

Well, while leveling on Khaini I have gotten this popup randomly about 3 times in levels 96 - 100, should I be worried?

The only programs running in the background are usually my anti virus ( NOD32 ) and the game itself.

No worries. Just log out and re-log in. Nexon's anti-hack system is just made of fail.

Not a problem at all (if you think you'll be banned). Just a nuisance. It generally happens when a player dcs but not entirely so mobs are frozen and you kill those mobs. Avoid chs/maps with people like that, and you should be fine. Can also happen after a internet problem that fixes without dcing you.

When a lag spike hits and you still move, the server recieves all that stuff that during the lag spike at the same time, there is a certain degree in wich the server can handle such a thing, but when you go over it you get that notice.

Nothing too serious just stay still whenever you get lag.

Thanks for the fast responses guys, I'm glad it wasn't a ban waiting to happen

Arans get it sometimes when you have BP and you get missed.

My DW got it a lot when entering a new map, using its mini-FJ right away, and attacking/getting attacked. I stopped it by just not walking around as fast...