Oh, I had that problem - I wasted 2+ months looking at my delivery window regularly getting pushed until I called them. It was because my account was in limbo due to trade-in expiration. 2 days after calling them and taking the trade-in off the account they pulled the date back to June 22 from November 22 (which would have been 13mo!!).
In the meantime I added the trade-in back, and again it's getting close to expiration; hopefully I'll get the Tesla before then
Original order 10/2021, RN 1158, MSLR MidnightSilver, Cream, 21", FSD
Current EDD 06/22 - 07/13