Purchased used in May 2015. Since I have purchased the car, I took it to a dealership in Kokomo IN to have it looked at for the Park Assist. What happens is when I am driving down the highway, usually with the cruise control on, going 60+ down the highway, the Park Assist comes on, all the lights on the dashboard flash and all the sounds go off in the car. At that point, the car disables itself and you cannot push the accelerator. You have to immediately pull off the highway and turn the car off. After waiting a few minutes, you can start the car up and the engine light will be displayed. The engine light will stay on until the next time you start the car and then goes off. Over the last year, I have had this happen approximately 20 times. The dealership in Kokomo couldn't find anything wrong with it and they stated they cannot try to find something wrong with the car if it isn't happening when I bring in the car. I moved to Tennessee the first of January 2016. It has happened to me since living here again so I took the car into Parks Auto Service in Columbia TN. After having my car for 2 1/2 weeks, they are unable to find out what is wrong with it. I have been very fortunate thus far to not get into a bad wreck losing my life or crashing into someone else and killing them. At some point, this will cause a major wreck and lives could possibly be lost or could possibly be disabled the rest of my life. At what point does this have to happen before Buick will find an answer for this? I need help on this as there are NO MECHANICS that can resolve this issue.