I will add. I have had two really weird stop/start issues.
First is within a week of getting the car, on two trips with the car when it started post stop it would bring up a warning of a break in attempt. Haven't seen it since (2.5 weeks later) but it's been too cold outside for start stop for a week till this Monday.
The second was this morning. So when the engine isn't warm enough, the outside is too cold, or if not cycling heat from the engine is going to change cabin temps too long, then it won't start stop. Those do no bring up the icon for the start stop, especially one with an exclamation. So this morning I saw the icon as I was heading to a red light. Brought up the start/stop in the dash, it said it wasn't running and needed service. Since I was at a red light I powered off my car and restarted it. No exclamation, engine temp wasn't high enough at the time, but I had a couple stops on my way to work and it worked fine at that point.
I think both are just bugs in the software. Miss reading simple instructions like "Car just started from start stop = Break in attempted" or "Start stop not ready because of X = Start stop not working". If I see it come up again in situations where it would eventually work (Engine temp up, above 20F, and cabin temp stable) if it will pop out of the error and start working.