Two major incidents occurred: 1)My fiance and I were driving on the highway with our four children at a speed of >50 MPH. There were no cars around us (front or sides) and no debris in the road, and the automatic emergency braking system engaged and brought the car to an abrupt stop in the middle of the highway. It happened a second time shortly thereafter at a speed around 30 MPH, again without any obstructions. I'm happy to provide the car for inspection upon request unless the manufacturer takes responsibility for this very serious malfunction and grants us a manufacturer buy-back. Stopping abruptly for no reason on the highway could have caused someone to rear-end us at a high speed and could have caused a very serious or fatal crash. I have spoken to the dealer multiple times (and I filed a complaint with Volvo Customer Care several weeks ago) and they say they'll try to "fix" it, but it's not a problem that we can ever risk having happen again. It is being inspected at the dealership now. There was no warning that this would occur. 2) There is a feature called "auto hold" whereby the driver can take their foot off the brake while sitting at a stop light and the car doesn't move again until the driver puts their foot on the accelerator. I was sitting at a stop light, using the auto hold feature, and even though I didn't put my foot on the accelerator, auto hold disengaged and the car started moving and hit the person in front of me. The malfunction of both the "a