After 12,523 replacements, Feds investigate Tesla Media Control Unit failuresArs TechnicaAfter ~3,000 write cycles to its eMMC NAND flash memory, complete failure occurs.

NHTSA thinks it knows what the problem is: an 8GB eMMC NAND flash memory chip—an SD card in other words—with a finite number of write cycles, fitted to its Media Control Unit. The MCU regularly writes logs to this chip and, within three or four years, reaches the lifetime number of cycles. At this point the touchscreen dies, taking with it functions like the car's backup camera, the ability to defog the windows, and also the audible alerts and chimes for the driver aids and turn signals.