Staff on another *harry potter* server is the key bit there. DA has a general policy of banning staff members on rival servers, due to having the entire map/resource pack from the 1.6 server stolen when this policy was not the case. With the amount of effort put into both, it's a precautionary measure more than anything. Recently, as well, we had new staff from another server outright say they were only online to steal builds, so it's not exactly.. Random. As for bans for being AFK too long- As I'm sure you're aware, to year up, you need a specific amount of online hours. In order to keep people from being AFK for that time period, AFK players are kicked after 10 minutes. Those avoiding said AFK kick by autojumping, casting, etc.. Banned. Hope that cleared it up!