general problems of the 2007 Kia Motor Rondo

I've had my vehicle since 11/2008. It was purchased used from a kia dealer. Although I knew it was a used 2007, it was not revealed until 02/2012 that there was more than 1 previous owner and that the back bumper was not the original. Overall the vehicle has driven well, but has 2 very specific quirks that truly need to be addressed by the manufacturer. I took the car in to the dealer regarding the 1st problem, which I see someone else on this site reported the same complaint; however, they told me that if it happens again to bring it back. It has been something that I've pretty much dealt with over the last 4 years, which is that sporadic/random starting/ignition or gas/fuel system issue in which I have to start and turn off the car several times before it will "rev" up and actually go/move. As another report stated, the driver had to "drift" home (or to a safe place to start back up again). There have been occasions where I thought it was good-to-go, but randomly lost its wind and I would have to go through the start/stop routine at least 6 more times to get moving. My 2nd issue is one of the seat belts in back does not always latch. If you pull real hard, it'll come undone, which is really scary especially w/ children. Like I said, this has happened many times since I first got the car back in 2008 and the mileage was much lower then. The mileage I reported here was notated on its last oil change.