I had that same thing happen to me. The problem is that you may not have a billing address associated with your card. The system automatically tries to renew your membership for 7 days prior to expiration. If you don't have a billing address associated with the card it can't verify the charge and it will not go through and your membership will expire. You can check if this information is there on your account page. It should be at the bottom. Once you verify that this information is there you can then renew right from your account page. there should also be a link to make purchase at the bottom of the page.