FedEx server returned error: No pickup on Saturday, Sunday or holiday (FF43)

Note: All times referenced below are EASTERN.
I get this error between 12:01am and 1:00am on Sunday nights. This is very annoying. I have to wait until after 1:00am Eastern. Is this a forced break from work or do you just want me to stay awake an additional hour? Thanks for any help that can be given.

Posted on behalf of the customer.