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What I find is that keeping it plugged in masks the problems with vampire drain , etc. Severe problems are noticeable when not constantly being masked by being charged whenever parked.

BtW, as directed by service, drained to 15 miles, then charged to "100%", which showed as only 281 miles (rated at 289), but charging stopped "complete" at 270 miles. Before I could even disconnect 4 hours later, went down to 268.

July 2018 Mcu2 and upgraded 3 chip.

Thanks for replying, but again ,I have, as well as mobile and virtual tech support, troubleshoot, monitored, and found nothing causing the drain. Live in s. Fl so temp not an issue. Did not have problem until software update and screen, then 12v replaced. Then it started.

2018 MX. 15,000 miles. Before, car lost 1-2 miles range in 24 hours sitting completely idle. Recent new software update (started with 2020.48.35 but now at 35.5) and 3rd replacement of main screen (another story for another time), upon reconnect and reboot after screen replaced sudden 12 v...