general problems of the 2010 Toyota Avalon

My 2010 Toyota Avalon limited sometimes stalls at 20 mph or when turning left, or switching lanes. It is as though it pauses, but doesn't die. It only happens maybe once or twice a week, but the Toyota dealer has not been able to find a problem.

I have a problem that I am afraid could cause me to have an accident. Just a few months after purchasing my 2010 Toyota Avalon I started having this problem intermittently. Sometimes it kind of stalls. Usually happens when I am turning from a complete stop, such as turing right or left. It is as though my car stalls for a moment. I give it gas, but it doesn't do anything for a few moments. Usually around 15 to 20 mph. If iam pulling out in front of traffic I almost get hit. Recently I was on the highway, I just pulled out and was going approx. 40 mph and it stalled for a few moments, maybe less than a minute. If a car had been behind me I would have been hit. Each time I told the service advisor @ the dealer I was told they had to be able to dublicate this. It only does it on occassion. But this is a serious problem.