Smart Brake Systerm

2016 Mazda CX-9w/27k miles. On three occasions it has shown the following error msgs:
Forward Smart City Break Malfunction
Front Radar Sensor Error
Smart Brake System Malfunction
All msgs. occur at the same occurrence. Dealer doesn't seem to have a clue. Front radar detector and windshield are clean. No fog & no windshield frost. If I turn off ignition and restart everything seems fine until next episode.
 
Is it really sunny or you're driving direction is o the sun when this happens? Really bright lights/sun can temporarily blind the sensors.
 
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