Tail Light Switch problems of the 2009 Jeep Liberty

In 2009 I purchased a Jeep Liberty (2009), for the past several months my car was making a strange noise. I've had a diagnostic test done on my vehcile (came back fine), oil changes, engine flushed, filers, transmisiion checked, all fluids the hole nine yards. Still I could here this noise. In January of 2013, we've had to repacle ball barrings, the sun roof jammed, I put in my back tail lights 3times keep blowing out, the door locks started to jam. On March 5, 2013, . I was driving on the freeway and the engine light came on, the car jerked as I contiuned, then it slowed down and this load noise started coming from under the hood of my truck. I got over into the far right lane and told my wife that the car started to go slow by it self. As I came into a parking lot and wanted to park my truck it jerk again, as I began to park my reverse went out, so I had to park in such away that I did not have to use my reverse to get out of a parking spot. I was taking my wife to a job interview with the secetary of states office ( what are the odds that happening to someone). My wife went to interview we took the service drive and some back streets to get to our home. I got up the next day to take it to the shop and the hold transmission had gone out and all the fluids were in our driveway. I don't have 100,000 miles on the truck nor is this truck five or ten years old. Why are all these things happening , this truck just turn4yrs old? we brought this truck 03/03/2009. Someone please tell me how your transmission just die and we've never had an accident, just the usual maintance on the truck. The dearlship said I did not purchase the powertrain warranty (100,000ml/10yrs. ) to repair, will cost me $5,000. 00 to get a new transmission . My job put us on 30hrs a week. Sincerely, mr. & mrs. Leonard king.