There's only 2 threads about that issue, afaik. Both of them suggest it has something to do with editing the config files or some other security-related issues, exclusively.
Don't get me wrong, it's possible that security-related problem gets you booted by admin. My point is -- it's most definitely not the only reason.
I was booted today by admin and I've never even as much as looked at the game files. I have played normally, logged off normally last night and got booted today when I tried to log in again.
So there. Admin is a human being too I suppose...