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Hold down both steering wheel scroll buttons at the same time to reboot the center MCU. This has solved a few random problems for me. It can even be done while driving without any issue on the S. Not sure about the 3 since you would lose your only display.
If problem persists through reboot, or comes back soon, contact Tesla, this is memory corruption and if it's not caused by software error, it could be an early sign of MCU dying.