Hey,
i noticed that during the last big banwave, i had 2 bots running which got error 3005 "There was an error loading the heroes data" one after each other (about 2 or 3 minutes time difference) and 10 minutes later both got banned.
Im pretty sure this error appears when a blizzard employee / gamemaster reviews you account / checks your gear etc.
There are no bans currently, but if you have an eye on your bots when the next banwave hits and you see this error, save your gold / equip asap.