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Heater Turned Itself On High

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Anyone else encounter this? Our two year old Model Y, while parked in a 72 degree garage and not charging, suddenly turned the heater on to HI and also turned on both front and rear defrosts. I wouldn't have known except I got an alert on my phone. The car also opened the frunk, I'm assuming to help the heat pump, which was running at full bore, cool itself. Already eliminated it being turned on by mistake from either of the two phones associated with the car.