2013 X3 Shaking when cold?

Hi, I've noticed that my 2013 X3 28i shakes when the engine is cold. This is most noticeable around 40 mph. The first time this happened I turned around, drove home, and took the train to work. I've noticed it a few times since then. After the auto start/stop kicks turns the engine off once it goes away.

Has anyone had a problem with vehicle shaking??

You sure its not the ice cold run flat tires?

It's definitely not the tires. It is the engine. I should add that it's not even "cold" here in new england yet. It's been about 60 F when I've experienced this. At first my husband and I thought it might be the gas. But we've filled it with 91 since and it still happens from time to time. I think if I bring it to a dealer they aren't going to experience the problem unless the engine is cold and even then it doesn't happen all the time.