There is definitely something wrong and the dealer keeps telling me that there is no problem. That is their answer for everything.

I have experiences something similar to this Prius owner's complaint. It occurs when going fairly slowly (5 mph?), when coming to a stop. Actually, there don't have to be any bumps in the road.

"I have been driving my 2010 Prius for 6 months and have experienced the following nearly 10 times," one owner wrote. "When braking, if a pothole or bump in the road is hit, the car seemingly jerks forward/accelerates for a split second."