I think you guys are talking about the same thing we had when we
reviewed the Territory.
It's the DSC (Dynamic Stability Control), for me it happened often when going round the mountains and pushing it a bit and also happened when the car is tilted when I was turning a corner at normal pace.
It feels like a shudder in the steering and you can feel the brake pedal pulsing if you are on the brakes.
If you look through the manual, you will find under the DSC (Dynamic Stability Control) section, what actually happens when the system is in effect.
Cheers
Paul