After 12,523 replacements, Feds investigate Tesla Media Control Unit failures

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.

The finite—and short—lifespan of these infotainment systems is a relatively well-known problem within the Tesla community.