Since it seems this issue has occurred across MS and MX...This same issue just occurred in my Model 3. v8.1 / 2018.18.13. The following messages appeared all at once:
- Traction Control Disabled / Contact Tesla Service
- Automatic Emergency Braking is disabled
- Car needs service / Steering assist reduced
They appeared while I was pulling into my garage parking spot - navigation had been acting up on this particular trip home in addition to LTE connectivity acting flaky. It's a particularly hot day - ambient temp around 95+ degrees F, though M3's screen was reading it as high as 107.
I left the car parked for about 10 minutes, then drove back out to the end of the driveway (cell service is better) to call customer service, but then the error messages were gone.
Seems that a commonality may be ambient temperatures on the more extreme, though everyone else's case here seems to be when it's cold whereas this was during heat.