update: Took it to the dealer yesterday, they said tis his the 2nd car this week brought in with the exact same issue and the 3rd this month, initially they refused to fix it claiming it is an "external factor", after 45min convincing as this is clearly a factory defect part, they're agreed to schedule for a fix under warranty. found this link happening to other lexus cars EXACTLY the same way, as apparently reflection of the mirror itself possibly causes the plastic to warp like that in middle of december, what happens if the car is parked outside in july im wonder? https://www.clublexus.com/forums/ux-models-2019-present/943797-2019-ux-300-f-sport-exterior-trim-melting.html