From Neteller FAQ regarding certification:
Why isn’t my account certified anymore?
US member accounts have been temporarily de-certified to revoke Peer-to-Peer capabilities. These accounts should be automatically re-certified in the next 10 business days, but Peer-to-Peer transfers will no longer be available to US members.
Also:
Why has my NETELLER account been closed?
If you recently performed a Peer-to-Peer transfer, your account may have been temporarily closed. Your account should be automatically re-opened within 5 business days, but you will no longer be able to perform Peer-to-Peer transfers.