Hatchback/liftgate problems of the 1999 Jeep Cherokee

I have replaced the back clasp latch once driver door and passenger door pins and latches both doors 2x the cost of each is about $200 each. The back hatch doesn't stay up when cold so I have hit my head several times. The front and passenger door won't stay open when pins or mech that holds door open goes out so have been hit by door, or swings too far and has damaged outside front wheel panel. The pins and door mech on both the front and passenger and one of the back door is out again. I feel that is a defect, however I called Chrysler and filed a complaint they have done nothing this is on my 1999 Jeep Cherokee and also on my husbands 1998 Jeep Cherokee he has driver door and back hatch door.