I've actually had the same error a few times when it was like zero degrees in Madison. You being in Chicago, I bet temps may have been similar and maybe had something to do with the cold? I haven't noticed any ill effects and now that it's "warmed" up a little, it has stopped. Also I don't have comfort access.
Current: 2016 M3 | Mineral Grey on Black
Retired: 2010 E92 335xi, 2007 E90 328i, 2010 A4, 2003 E46 325xi