Action required to Verify Your Seller Account

Hello,

I am active seller (no recent sales, though) and active user of Seller Central. The following has happened today roughly in this order:

1. My Amazon Seller account became inactive, with no advance explanation AFAIK.
2. I eventually received an email with subject: Action Required - Account Set to Inactive due to Dormancy.
3. My listings were deactivated.
4. I received a 2nd email with subject: Action required to Verify Your Seller Account.
5. A link newly appeared on the Account Info page entitled: Reactivate Account.

When I follow the email instructions by clicking the Reactivate Account, it redirects me to the error page that says my account is inactive. It appears that I am now in an infinite loop; the error page takes me to Account Info, and the Reactivate Account link on the Account Info page takes me to the error page. Does anyone know what might be wrong and/or how to fix? My listings appear to be down, and I have very limited access to Seller Central.

Thanks!