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Thanks a lot gues. Make Power off and close ABetterroadplanner in browser ... make 20 km to closest supermarket and back. NO blinks NO white screen NO reboot. Tomorrow planes trip >300 km. Let’s see. Just in case it happens again will write to all report.
¯\_(ツ)_/¯
Unfortunately the problem remained. Apparently all the same died MCU. 200 km all was normal. Then it started again. stopped once more. For 5 minutes, turned off all power and double reset the buttons with the steering wheel.