This happened to me this weekend, haven't had a chance to see the dealer yet about it. Went away after restarting the car.
Quick Google returns two items of possible interest, neither of which were applicable to me:
1)
Honda Sensing failing on very sunny days essentially implies that sunny conditions may overload the camera and overload the system into an overload state. (I was driving on a cloudy day)
2)
Issues with Honda Sensing. Full system shutdown essentially stating that a radar detector placed too close to the sensing camera can overload the system (I don't have a radar detector).
My situation: overcast day, draveling away from the sun on a highway with light traffic, cruise set at 60, following a car doing 57ish, I got a warning tone and message for CMBS problem. Unable to re-engage cruise until I stopped the car for gas and restarted. First such issue in approx 1500 miles since buying the car new.