A GP will review your log record prior to banning you. If within a small time frame you have been warned + banned several times, then the GP has the possibility to increase your ban time by giving the "multiple bans" reason. Think of it as Graal's version of the Three-strikes law. The only difference is that it takes many more minor ban infractions on Graal before receiving the Multiple Bans reason. Anyway, those who receive these bans shouldn't be defended.