This has happened a few times over the last 2-3 years. At first I thought it was a tire balance issue. But, now I know it's something else. It seems to happen more often now. When it happens I have to pull over and come to a complete stop, then start again. Once I do this the shudder goes away. My dealer doesn't know what is. They have offered to take it for a drive, but I've put it off, as I am fairly certain they can't replicate the problem. Has anyone else had this problem?