My assumption is that the factory will, at some point, switch from one software build state to a later one. But at the point of that switch, there will be cars in transit to dealers still at the previous state. But it looks like the dealers are not updating those cars at the point of delivery - even though they could - relying instead on customers complaining about the problem before they instal the update. For September 16 registered cars, I would have thought it reasonable for those cars to have an update issued in April, but if you're having the Trip A problem then that suggests otherwise. There are earlier posts in this thread giving the various build states, for mine after RC5 it's 0C.091.01.0021, dated 25 Jan 2016. You can find the build state buried in the system menus, from memory it's something like Settings>Android>About.