Its hit or miss with the Disney site. If you keep trying over and over you should hit a good server and get it. The bugger question is WHY?
As we know, the Disney sites have been awful for decades! The Walt Disney Company is biggest enough to be able to afford to build a perfect digital infrastructure!
The Disney Company just doesn't want to spend the money for this.
I think Disney knows their customers will just keep trying until they get their booking?