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.
2010 e92 335i xDrive | AW on Coral | ZPP | ZMP | ZCW | Nav | Logic7
KW V1 | Cobb | BMW Performance Exhaust | Alpina Tranny Flash | Lux V3 and Weisslicht