Using exploits or bugs that are unfair for other players (even in absence of other users in-game)
Server ban with incremental duration each time
Spamming over chat or microphone (except playing bearable music when no other is already)
Communication block over the used channel with incremental duration each time
Spraying highly inadequate content (racism, pornography, terrorism...)
Spray removal and variable counter-measure(s) (warning, public humiliation, server ban, etc.)
Insulting, badly offending or being racist against anyone
Communication block with incremental duration each time, even permanent (chat and/or mic)
Using hard game hacks (aimbot, wallhack, etc.)