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Same happened with mine this afternoon. I was downloading a navigation update and thought that must have caused it, but like you, when the screen came back on I noticed I had heated rear seats and steering wheel! :)
Hoping someone can give me some advice.....I ordered a Model 3 SR+ on 3rd October and have completed all the steps and have a delivery date of 29th November @ Trafford Centre. However, I haven't yet got a VIN - is this normal?