I had a similar problem with
I had a similar problem with my 2009 Tribeca. The dealer's service team ran diagnostics on it several times but couldn't find anything wrong. They believe it's a microprocessor design problem and can't be repaired. My experience suggests that there's a correlation to this happening when I leave the cruise control on, but have braked and am driving without it. Fortunately, I figured out how to deal with it. I carry a 10 mm wrench in my glove box. When I feel the car start to buck, I pull off the road, turn off the engine, and use the wrench to disconnect the battery. Let the electronics discharge for about a minute, then reconnect the battery. This resets the electronics in the car, and you should be fine after that.