I've had my terrain for almost 2 months now and recently I've noticed a gas-like odor coming from the air vents. It doesn't happen often and when it does it only lasts about 10 secs, but that's concerning to me. Anyone have the same issue or know what that might be? I've emailed by dealership and await their response. I have a 2011 SLE-2 V6 AWD. Thanks!!