My 2012 and 2013 did something like this once as I recall and then all was well. Kind of like my iMAC, millions of lines of code and all very sensitive to clean stable power. Am surprised this doesn't occur more often. But if it occurs again and you have any B2B warranty left I'd get it in to your dealer.I doubt your 12v is bad. There have been random reports of Center screen lockup and/or reboots with no lasting effect.