Hatchback/liftgate Lock problems of the 1999 Dodge Durango

I bought a 1999 Dodge Durango from carter CO. Dodge. I did not start having problems with anything until about 6 months ago, when the passenger rear door lock and window were beginning to have problems opening. The window finally quit working and now the door is also having problems opening. Just recently the rear tailgate door has started acting up also. Sometimes it will open and other times it will not. It wont open even if you use the key. I am afraid this is going to lead to a major problem if these locks and windows quit working all together and I have a problem getting out of the vehicle. After speaking with the woman that owned the vehicle prior to me, she informed me that she had replaced the door locks twice and was tired of having to do this, so she traded the Durango in. I am afraid this is going to become a saftey hazard, and would like to see this matter investigated to see if there are more complaints than just mine. Thank you patty gibson.