Yeah I remember getting a warning, but I don't ever remember combat logging, everytime someone has attacked me I've stayed and fought until the end. I guess if log out when someone is close by that counts as combat logging or am I confused.
I got banned even though I wasn't even doing it, After they removed all my pigs from lagging the server I took that as a warning and stoped making more pigs, but someone else was making them after I stoped.