If you're playing all the characters from the same directory and camp all of them out all at once, this can happen in my experience. I don't know if it's the client trying to apply all the client settings at the same time on logout or what the issue is, I just know that I could replicate it randomly when doing a /bcaa camp command so now I /bca camp and then a second later issue the camp command for the control toon. The client seems to not have an issue with a staggered logout but if you hammer it with a few all at once you're rolling the dice.