Over the years my 2006 2.8L 9-3 Aero-Combi has occasionally indicated a traction control failure. Usually goes away after shutting down and restarting, always in the winter. A few days ago I washed the car, and immediately had a multiple system failure that hasn't resolved. The nav froze and shows me still at the car wash, and the other systems mentioned have failed (per the car's computer warnings). I've since driven it maybe 10 times, and yesterday 150 miles in 40 degree weather, so no ice anywhere. So far as I can tell everything else is perfectly fine. Any idea what could be causing this?