Our Tesla is being serviced so I'm in a loaner. Today when pulling into traffic the steering locked up for 5-10 seconds. It would not turn at all until the service warning came up. I was then able to turn the wheel with no power assist. I nursed the car into a parking lot and did a two thumb wheel reset and recorded on my phone the same thing. Basically, there was a loud buzzing sound coming from the frunk near the brake pedal. When you try to turn the wheel the power assist literally would buzz and prevent any movement. This continues until the buzzing stops while at the same time the dash service warning pops up. We have this same model S. P85 2014 no AP. I can't help but feel concerned about this method of failure. The steering should never lock up. I should always be able to increase effort and turn the wheel. The only warning I had was the start of this buzzing sound near my feet but I think when I first heard this sound the wheel was already locked. I was stopped at a stop sign waiting to shoot across a busy divided street to go left. When I saw a gap I gunned it and found the wheel frozen. All I could do was go straight across to the curb and try to stop while leaving the most amount of road behind me while I waited for the car to release the wheel. Do these preAP cars have hydraulic power steering or is it simply an electric motor assist? Has anyone else had this issue? I didn't see anything similar after a search. Tesla had me do a full shut down and restart which cleared the issue and all seems fine now but I had no warning before so I'm left worrying it could happen again. Then I go on thinking it could happen to mine? I love my Tesla. I've had no major issues with it. I'm curious to hear what everyone else thinks about this.