2016 BMW 320I Electrical System Problems

The front brakes are locked up and I went to the dealer and they are asking $7000 to replace the dsc module. It was also braking while I was driving on the highway and I got scared and pulled over and checked everything looked okay but i didn’t know what happened. I am glad nobody was behind me when the car (bmw)brakes it self while it was running. I hope you do a further investigation and see what is happening to the bmw brakes. It only had 52139 miles when I send it to bmw of Dallas and they took 3 days to find the problem and told me I need to pay $7000 to replace the dsc module (abs module) I can’t afford to pay that kind of money what do I do

CAR HAS SHUT OFF WHILE IN MOTION AND INDICATOR WARNING COMES ON SAYING 'DRIVE TRAIN MALFUNCTION' THE GAGE INDICATES THERE IS AT LEAST 42 MILES OF FUEL BEFORE EMPTY. LUCKILY THIS HAS HAPPENED ON A CITY STREET. THE CAR SHAKES AND MAKES A LOUD SOUND BEFORE PUTTING ITSELF IN NEUTRAL. ALSO THE BRAKES WERE RECENTLY REPLACED BY BMW BUT THEY DO NOT STOP PROPERLY AT SPEEDS OF 50 MPH. ALSO THE SUNROOF OPENS INDEPENDENTLY WHEN IT RAINS. THIS HAS HAPPENED ON 3 OCCASIONS WHILE PARKED OVERNIGHT.