general problems of the 2010 Dodge Grand Caravan

Bought brand new Dodge caravan Mar 23 2010 and June it killed while driving 40-45 mph and took 45 minutes to start again. Brought it to benson in greer SC where we bought the car and because the computer did not show anything they did nothing. Killed again and brought to dealership. Said they would hook it to computer but could only fix it if it showed something. Luckily it killed on them and they had to push it into shop. The car killed again for the third time of us, and barely missed having an accident. They told us that it was one of two parts and they had only replaced one previously. When asked why they told us they would have to pay for parts if turned them into gmac and they were good. They obviously had no concern for our safety or others on the road when the vehicle just suddenly stops when driving accelerated speed. It was considered a lemon by there arbitration board however, they just tell us to drive it till it kills again or kills us or someone else. Benson dealership, greer SC.