I have an intermittent problem with my Santa Fe shifting from 1st to 2nd gear. When I first start the vehicle mostly on cold start it will slam into second gear almost as if you were rear ended. If you stop put it in park and shut the vehicle off, then restart it. It will shift with no problem. Every time I take it to a mechanic then can't replicate the problem so they can't fix it. Does anyone have an idea of how to address this problem?