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I've had no cell service last two days. No change with multiple reboots and power downs. Was planning on forcing reset by pulling MCU fuse until I saw someone else on FB reporting same problem.
This happened to me this past Friday (pre-v8.0 install) in places that I have ALWAYS had LTE coverage. I could not load maps, listen to streaming audio, etc. It seemed to be an AT&T issue (maybe someone at Tesla didn't pay the bill? lol). After a few hours it was back to normal without any input from me and no software updates (at least ones that I could see).
I've had this problem for at least five months. My Model X used to have full LTE where I live, but now it's 3G (if at all) until I get at least 3-4 miles out of my neighborhood. Service Center didn't find any problems or have any explanation.