I don't think the delivery change has anything to do with the factory power loss! My delivery was also changed from "Late August" to "Late August - September" although my P85D production was finished on July 10th and is in transit since then. Many users have reported the same thing over at the Tesla forum. Seems like an a general (automated?) change.
We need to be patient! :wink:
Good info and reassuring in a way. Besides, my being frustrated won't get the car here sooner, so I appreciate your optimism!