I don't have FSD, but I lost autopilot a few days ago while I was on vacation.
Apparently there's something going on with the interface between sentry mode and autopilot if the car isn't able to "sleep"
The tech told me to turn off sentry mode and then power the car off. wait 3 minutes then power back on. Autopilot reappeared.
I enabled the "don't turn on sentry mode while at home" option and now I have autopilot again.
worth a try to see if you're having a similar problem
That is a separate issue, and (confusingly) started happening around the same time. I had both problems recently.
The sentry-always-on/autopilot problem manifests as no lane lines showing on the screen, and none of the autopilot features work until you let the car go to sleep and wake back up again. (Possibly it helps by by rebooting the autopilot computer.) I think that was a 'bug' in the car software. (Maybe a slow memory leak and always-on-sentry never lets the autopilot computer reboot?)
The missing-FSD features problem shows up as features like NOA disappearing on the car, and Tesla web site offering to let you buy FSD again even though you had already bought it. That seems like a "backend database issue."
Maybe they are trying to clear out the accidental freeloaders that got FSD without paying for it. And their process was mistakenly deactivating some people that had paid for it.
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