Take it to dealer and have them check history and apply the tsb fix that came out in May this year. I did and it workssame problem
I was getting "collision mitigation braking system problem. see your dealer" every couple of days. Took to dealer in Costa Mesa, CA, and the ony thing they did was reset the system! Of course it came back the next day.
Then took it again and they reset it again. I told them this is unacceptable, and then they talked to Honda and adjusted the brake pedal. After one week the problem started again.