I got my model x 100d on the day 8.1 was released. All the driver assistance functions stopped working after I updated to 8.1. I like OTA because tesla did something other manufacturers can't do or won't do. But one of the disadvantages about OTA is we are basically all beta testers. So I am not mad that my autopilot is not working after 8.1 or it is taking so long for them to fix the issue. What made me mad is they locked my car to 85mph top speed without telling me anything about it. Today I almost had an accident when I was trying to pass someone on the freeway. A Civic was driving 65 on the carpool and speed up to 75+ when I tried to pass him. I barely made it because my car stoped accelerating after 85. (most of people in socal are driving 80mph on freeway). I called service and they told me all the loaners and inventory cars are speed locked to 85mph and they forgot to unlocked the speed limit after the car was delivered to me. Also I found a lot of people are saying tesla did not disclosure the speed limit when they got their loaner cars. I can't believe they are so irresponsible and careless.