After 3000 miles with my S (Signature Special Performance #61), I got today for the first time the dreaded "Needs Service - Power Limited" error. Naturally it happened as I pulled away from the curb with five people piled in the car for a test drive -- possibly the extra passenger weight triggered something? In any case, the car had very little power and wouldn't go over 20mph; I had to drive slowly and embarrassingly around the block and back to the house. After they all got out, I stopped and restarted the car a few times, rebooted the touchscreen, drove around a little bit, and after ten minutes or so the error disappeared. (And the car has been fine for the past 20 miles since.) This is with 3.0 firmware (1.15.14); for some reason my car hasn't been updated to 4.0 yet, let alone 4.1. But just a FYI, that if this does happen, it can fix itself. I'll call Tesla tomorrow and find out if there's anything they need to look at.