So I configured my car on the 15th and have not received a VIN, despite the sales associate saying it should be "imminent". I was starting to get worried but looking at the Model 3 Invites spreadsheet, it looks like very few VINs have been assigned for people who have configured in the last few weeks. Filtering by configuraiton date, I see 68 configured cars since January 6th, but only 9 vin assignments (~13%). Do we know what's going on to cause the delays?