I hardly play the game but I still end up getting kicked due to hacking. Any time I get a 4k-5k headshots I immediately get kicked. So I play with friends , that way I won't get kicked.
The reason you and every other decent player gets kicked in crossfire is because the game is filled with KIDS, Brazilians, and Egyptian hackers. The game is so hack infested people can't tell the difference between a legit 5k headshot and killing 8 players through the wall.
In all honesty you should quit playing crossfire and play csgo or source.