Yesterday Fax Slow: Is there any server slow

When I fax Then i receive the email from the ring central of the status for the faxes submitted. The email notifications I received were extremely slow today. Usually it takes no more than 30 minutes to fax them all and to receive the emails from ring central about the status. But today it took more than 3 hours. This was my concern. Now all is faxed. if it is possible to check what the problem was just to prevent it from happening in the future I will appreciate.