Brake Master Cylinder problems of the 2012 Ford Fiesta

I have a 2012 Ford Fiesta which has had nothing but problems over the course of the time I've had the car. On the Thursday before the memorial day weekend I put the car into reverse and the car wouldn't stop. We were going very slow and thank goodness didn't hit anything. We hit a curb behind us that stopped the car. I shifted into drive and it moved forward. We took it into the dealership that next morning and they replaced the brake master cylinder and the clutch. I've done multiple warranty claims & I've had ongoing trans/clutch issues that finally resulted with as replacement last month. Now the car is no longer jerking and slipping but it's slower with decreased gas mileage. I've had a sync issue/ radio electrical issue and took it in multiple times, it's still not fixed. Recently the radio/sync completely fails but it's intermittent. Now I'm being told that because the sync/radio issue is intermittent, I have to wait until it's not working completely to take it in. In the last 6 weeks the car has been in twice for brake issues, (I took it back twice in the same day + trans replacement) then again two weeks later. I'm on the third time to the dealership over the sync system in the last year, that is still not fixed.