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In addition to the above suggestions make sure the vinyl strap from the trunk storage cover isn't blocking the latch.
I had this happen after mobile service did some work on my charge port door. I assume they removed the tail light assembly and then reinstalled it. When it was replaced I suspect the stops integrated into the tail lights were off by a little bit.
A simple fix - no need to wait for mobile service.
I adjusted the rear stops on the hatch. They are simple to adjust - loosen them a little, lower the stop and tighten. There are a couple of videos on YouTube out there that demonstrate. After a few tries it closed and locked with no issues 100% of the time.
This is the video I used to guide me:
Hope this helps!!
Mine is not latching suddenly about 3 weeks ago during a short trip. On the way home, MY just disable the AP and I have to drive manually. Had a mobile service came last week and confirm that the sensor is bad and the trunk door latch has to replace. The tech is very nice but he doesn't has the part with him and thus I have to wait for another appointment. Hopefully will get it fix this week (2nd appointment). I described the issue when I request the service request and if Tesla pay more attention, they can carry the part (if the part is available and is small in size) and 2nd appointment can be eliminated. I haven't drive the car for 3+ weeks due to this issue since it disable the AP and won't allow me to lock the car at all. Also, the A/C will come up from time to time (even I tun off temp control) and the car still used about 20 miles range of electricity per day.
I had the exact same problem. I tried and tried adjusting the stops and it didn't help.
When the mobile tech came out to install the homelink, I had him look at the hatch. He was able to adjust it, but when doing so, the hatch was out of alignment and skewed to one side. My choice was either to have a poorly aligned hatch or have a hatch that didn't close without a little help. There was a third choice, which was to bring it in and let the heavy-hitters get involved. I had him re-align the hatch back to its original, perfectly-aligned state and was willing to live with the problem for the time being.
My advice is you wait a while and use the hatch as much as you can to get it all broken in.