I might be able to add a little to why it might be auto-stopping for a shorter period, that is a significant factor of the amount of "juice" still in the starter battery. If your battery is loosing it's ability to hold a charge, the car will auto-stop for shorter periods because it senses, apparently, the need to make sure there is charge in both the IMA and the starter battery. While we were having problems getting Honda to replace a defective NEW battery, the auto-stop would never shut off for more than 10 to 20 seconds and then restart the car. Apparently afraid it would leave you setting at a green stop light with no charge to get going again. With the new battery, which they finally provided, the auto-stop is off until I decide to go again, as it should be. Sure makes sense to me. ...Bob