Hi Flok, I got in touch with ZAM and they said that your recurring premium subscription was unable to be renewed as of February 22, 2017. You will need to sign up for a new subscription utilizing a current payment method to get premium back. Once you do sign up, log out and log back into the site.
If you have any questions about this or think it's a mistake email accounts@zam.com and they will be able to help you.