The same thing happened to me on Saturday and now again today. On Saturday it came back in a few minutes.
Strangely, it didn’t affect the Model S that I already own, it only affected the outstanding order for a Model 3. Must be a glitch with the pending orders only.
Given that so many folks with orders pending are on this thread, I have to ask, have any of you gotten a VIN yet? I order two weeks ago with the expectation that it would be 2 weeks till delivery, but I have no VIN and no contact about how close or far it might be.