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I'm new. I have a 2018 Mazda 3, 6 speed. The braking system (which I find unnecessary on a manual) recently braked on the highway with no one in front of me - thank God there were no other vehicles, esp trucks, behind me. The smart brake, temperature and lane departure lights stayed on for about 15 minutes after I started the car. I was unable to change the stations during the 30 min drive to work. The dealer has not found ANYTHING wrong with the system. Has anyone had these issues in the past?
 

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Can you go into the settings and disable it?
Check to make sure nothing is on your windshield infront of the sensor.
Check your battery terminal connections to make sure they're tight.
Try an ECU/Computer reset by disconnecting the battery for 45 min.
 
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