Honestly I've overlooked alot of bugs since launch in hopes they fix them. Yesterday I ran dragon star arena got to the 7th arena and up pops "server maintenance in 15min" was mad we lost our progress but I could have looked on the forums (I think they should give you an hour warning), next day we go again, get to the final boss and he glitches out completely, like dissappears and we couldnt get him to respawn. so yea, fun game.