Nostalrius Begins - Quality wow vanilla realm (1.12)

So my girlfriend and i were playing on this serv in our apartment, i've created my account early december and she joinned me a week or two after. I'm playing a Warlock lvl 46 named "Syleciss" on the PvP Server and she's grinding a hunter night elf lvl 31 named "Elaneith", same server.

She played like half an hour (maybe one complete) before diner and we were planning to play just after our movie, but our accounts are both banned, no specifics reasons on the website, no email, nothing.
So can someone tell us what's happening ? We were afk from 26 december until 30th just today.

And i prefer to annonce now that we have never bought any gold, we have only one account each and one character on it, and we're playing on our own computers, except one or two time when she played on my computer.

PS : I also want to say that our mail adresses are not hacked, we have never shared our passwords, and our computers are clean with MalwareBytes and AdwCleaner.

Thanks in advance for any futher developpement.

Greetings and thank you for you quick response,

I change my password and i still got the same message during 10-15 mins (account locked and banned), but i saw after that the topic of logins error and knew we have to wait long enough so it could work again. So thanks again and we're glad the ban message wasn't really relevant.

Happy holidays to all the staff and good night.