We have a 2019 MX, and two 2020 MXs (Dec 2019 and Sept 2020 deliveries) - all three have exhibited this behaviour. One vehicle had to be towed 100 miles from Breckenridge down to Denver. I spoke with my SA while the vehicle was being towed and he indicated that he'd had a couple of other MXs with the issue and it was due to a corrupt memory module. My vehicle sat for 6 days waiting to be diagnosed. Wednesday evening (5:15) I spoke with the service advisor (again) and told him it was unacceptable to still be waiting and asked who to speak to to escalate. He advised me that the Service Manager would call me that evening or first thing in the morning. I received a call at 9:30 AM on Thursday from the Service Manager advising me the vehicle was ready to be picked up - he offered all kinds of platitudes but basically they were swamped. As the SC doesn't open until 8am, it took them 90 minutes to diagnose and resolve the issue. I don't know for sure they replaced the memory module, but we're still seeing the Park Assist error and the garage door issue.
Some additional background - we rent Tesla's out so no we're not independently wealthy
, when the vehicle broke down both screens were going black, our guest was a long time Tesla owner and figured to just do soft reboot. When they did, the AC remained on, main screen came back on but was unresponsive, cellular connectivity wasn't there (neither was GPS as we found out when we tried to nav to them and the vehicle), the vehicle was trying to do an update. Our guest did soft resets and a full shutdown (from the menu) and finally the vehicle was stuck with black screens and would not go into drive.
Within a week both of our other MXs exhibited some or all of the same characteristics and both refused to complete the current software download. After several tense moments when we got in to the car and the screen was black and/or wouldn't go into drive. I called our SA on a Friday evening (8 days after getting our stranded MX back) I left a message indicating my concern and asking him to call as soon as he got the message so we could formulate a plan. Eleven days later I still have not received a call - I have solved this to some degree. I was able to get the firmware to update by doing a factory reset after which it seemed to install just fine. We still have issues with Bluetooth and the user settings don't seem to "take" consistently - ie my seat and mirrors keep getting un-set even if it's me driving, leaving the car and then returning.
Final note - if you get both screens black and the everything SEEMS dead, it's not really, it's just stuck. Double Scroll wheels for 6 seconds then release and you'll kick off the boot process again. This has worked every time - although once it took two triggers of the reboot for the screens to come back.
All in all, I love my Tesla, but right now I hate the SC experience. Colorado has had a huge increase in Teslas on the road, so I've tried to be patient, but it pisses me off that if I make an appointment my car won't be diagnosed or worked on that day, and if I have it towed because of what is obviously a Tesla issue and under warranty, there is no special consideration. It's hard enough when it's your personal vehicle, but I lose money every day my cars are in the shop. Part of the reason we only have Teslas in our fleet is because the maintenance downtime is in theory much less than an ICE vehicle, however, one trip to the SC can take my vehicle out of service for longer than an entire year's worth of ICE maintenance.