I called my service center (Rockville, MD) two days ago about the total failure of my Nav system (at the time it had me in the middle of the Atlantic Ocean and of I'm not mistaken, there are no roads there). Rockville told me they'd pull the logs and get back to me ASAP. I've heard not a word. Called again this afternoon and left a voicemail about the problem and the failure to call me back. Again, no reply. I have an expensive 4-year service contract which I just renewed. Ordinarily I'm not one to complain and I've cut Tesla a lot of slack in the past, but to be blunt this is dreadful customer service. I'm thinking that maybe the leadership at Rockville has changed and the new service manager doesn't hold his or her team to the same high quality standards I've experienced at Rockville in the past. Ot maybe Tesla corporate is to blame. Hard to know. Having no nav is a real problem especially since the car can't calculate whether the state of charge is sufficient to reach a destination. Is there a national number I can call to complain about the poor service a Rockville? Since Erick Pinzon left things there appear to have gone down the tubes.