Has anyone had the odometer on their Volt change? Took our 2012 in for a software upgrade a year ago and it came back with 60,000 miles less on the odometer. Not a problem then because I had no thoughts of trading, but now things have changed and I'd like to get it fixed. Just spent 4.5 hours at the dealership for them to replace the BCM only to have that not fix the problem. So now I have a loaner and they have no idea what's going on. Any thoughts?