Automatic Transmission Control Module problems of the 2005 Kia Motor Spectra

2005 kia Spectra has automatic transmission problem. Several kia mechanics at various kia dealerships (banner, pat peck, and kia of slidell) say performance is normal, but it slips out of gear on the highway, almost putting our family in several accidents, because it scares us so much. Our family loves the Spectra, and takes very good care of it, but this unsafe condition has made anyone we know fearful to ride in it, when they feel it bucking in and out of gear, on the highway. Please convince kia to stand behind this car, and repair it to the condition we were promised - thank you. The car has always done this, from what we remember, and various times kia service people have said that this is just the way the Spectra is - the last visit, they convinced us to flush all of the fluids, to take care of any issues, once and for all, and now it is worse than ever. We are complaining to you now because it has become almost unusable for other than going around the subdivision. Some chat boards say the 2005 has a faulty tcm (control module), but kia has not acknowledged that to us, and said the reprogramming took care of it (this did not).