Radio/tape Cd Player problems of the 2012 Dodge Caravan

Ok. I've only had this vehicle for 2 1/2 year and I've found after a year, it was hard to keep gas in the vehicle even though I filled it up at times, it would still go out , the doors have gotten jammed, the windows stuck because of heat, last year the seat belts in the back stopped working and now I have a transmission problem and the vehicle will only go backwards. I never knew those things could happen to this vehicle. Also the alarm no longer works after 2 years. I have to take the key out just to open the vehicle. When I got the vehicle , there was a cd stuck in it and radio didn't work and couldn't be fixed.