Really need to know your class. There are certain abilities that can trigger the system to do this. For example, skills that reflect damage when you take damage tend to cause the GM ban message to appear when you are doing nothing wrong. Try disabling them if your class has one *Aran, mechanic etc*. There are a few other skills, sadly I can't remember what they are.. Jett's third skill that you hold down and does constant damage can cause it as well.
