This happened to me twice today, one right after another, first in u13 ctf, then in #fracs. ctf. Both times were almost exactly the same. In the middle of the match, I run out of ammo on my aug, and switch to my knife and as soon as I throw it, I got kicked for a possible cheat. (Happened in both servers) I'm not sure what caused it, but I have a feeling it had to do with there being other weapons on the ground when I threw it.