So I just got my Blazer a week ago, and I absolutely love it. However, for no apparent reason whatsoever, the automatic braking seems to go off, flashing the red on my windshield, vibrating my seat and slightly braking. Today it happened two times and there were no cars in front of me or passing me!

 

Assuming it's like my Silverado, there are different settings in the menu for auto brake reactions. However, being that there were no vehicles in front of you best to go back to the dealer so they can test the ADAS to insure you have no problems with the system. Everything is still under warranty.