I had the same problem, except you can fix it for free.
The problem is that the cable used to pop the locking mechanisim was set a little too long in relation to the latch.
The cable has this little metal ball at the very end. When you pull it, the ball pushes the mechanisim to open.
So what you have to do is, take apart the carpeting in the rear of the hatch. (It's all held in by clips)
You will then see the mechanisim. Loosen the main screw that holds it and turn the bracket more towards the passenger side. This will offer less travel on the cable before the metal ball pops the mechanisim.
Problem solved for $0 dollars.
