Forward collision system turns off while driving causing vehicle to randomly jerk an slow down in traffic. Taken the vehicle in 4 times to have them look at and service center refuses to help me an give me any information on when there will be an update. Received an email for a recall made an appointment for said recall arrived at shop and my service was refused. Asked for documentation on service being refused an got told they could not give me that. After an hour of debating finally receive paper. Leaving store once again my cruise control turned off an vehicle jerks. All this has taken place at Billion Nissan in Sioux Falls. They are unwilling to assist me in anything for my vehicle. Have documented proof of all occasions and I am still refused service from the shop.