I agree with the post that began this thread. My Model S nav became severely disoriented after the last major upgrade, so I called the service number. After about a 20 minute wait, I spoke to an agent who looked over my logs and told me that the new maps had downloaded but, due to their size, had not fully loaded. When I mentioned I was planning a trip for the following day, he assured me everything would be fine.
It wasn't. The nav sometimes put me on the correct road, but mostly had me off road, sometimes many miles away. Directions were naturally incorrect, so we pulled out the iPhone. When I returned home I called service again. This time I spoke to an agent who told me that, in fact, the new map did not download and that was my problem. I was passed to another agent who confirmed that, and told me that he would contact my local service center to have them initiate the download. He further stated that if that, for some reason, was unsuccessful, he would have them come to my house and upgrade the maps there.
I waited four days, but no maps downloaded and no one contacted me, so I called the SC (by using the option that my car was already there so it would ring at the SC). I only got VM, and left a message. When I didn't hear, I sent the service agent I usually communicate with an email, but never received a response.
At this point, one week after my first call, I tried calling service again. After nearly an hour on hold, I spoke to an agent who listened to my issue, and then put me on hold while he reviewed the previous calls and my logs. After 5 minutes, the Tesla phone system transferred me to my SC and told me to leave a message, which seemed pointless, so I didn't. The agent never called back. My nav is dysfunctional and I have not got a clue what to do except waste half a day and drive to the SC. I think that is unacceptable. Really unhappy. Thanks for reading this.