I once received a ban on 2 accounts and to this day I don't know why it happened. I was running through Sea after finishing up on killing some Jailers with my LS (no, I wasn't flee hacking, one account was on PS3 the other on PC), and boom, d/ced and had LM-17 when logging in again. My mule account, linked to the same SE account, was still online, so I was able to talk to my LS to let them know what was happening. I had to wait for the service center to open, and when I called they had no idea what happened either. They had no record of a ban on my accounts. They reset my passwords (I use a token, but the POL password on both accounts was somehow corrupted) and I was able to log in again.
Don't give up, call SE and ask what happened. Perhaps their auto-ban program went nuts again.
