Answer: Banned for no reason
A lot of people are complaining about the fact that they are banned for no reason.
this might help if you're playing through stream.
AC is detecting steam as a 3th party program (3th party is bannable)
so if you are using steam and you're getting banned after a patch than you should download the game from here:
Free-to-play Online Tactical Shooter - Arctic Combat
and start playing the game with the ac loader