I have an 02 Optima LX V6 that has been very reliable except for some transmission and electrical issues. The electrical issues with the door locking system are tolerable, but the transmission issue is starting to get scary! My vehicle, while travelling in high gear, hesitates slightly and then abruptly downshifts to 3 gear losing overdrive and torque converter lockup. The check engine light comes on and the tachometer shoots up over 3500 RPM. I have noted that the problem is most likely electronic, as I can shift to neutral, turn the vehicle off, start it back up and the gears are back. The check engine light remains. There have been numerous attempts to repair by more than one dealer and multiple complaints to the manufacturer to no avail. At highway speeds, this little downshift could cause you to lose control of this vehicle. Anyone have any information on this? I am scared to allow my other half to drive this vehicle for fear of accident. Please advise.