Battery problems of the 2010 Toyota Camry

On Friday, 25 March, 2011 at about 4 pm, my wife experienced a sudden deceleration event on our 2010 Toyota Camry. She made a right turn & in about a half mile, the Camry suddenly slowed to less than 10 mph from about 40 mph. She pulled into the first parking lot to the right and shut off the Camry. She said no matter how much she pressed on the accelerator, the car was not responding to the accelerator. She said the check engine and the stability control lights were on. She tried restarting the car and drove a little in the parking lot, the 2 dash lights were on, but it was driving ok. She drove the car slowly approximately 5 more miles to our home. I arrived soon & I checked the codes with my diagnostic tool, and the ecu was showing an active p0121 (throttle/pedal position sensor a, circuit range performance). So we drove the car slowly to atlanta Toyota, 2345 pleasant hill road, duluth, GA 30096. During the drive to the dealership, the dash lights went off. I reported the code p0121 to the service rep, and the driving symptoms. The next day (Saturday, 26 March 2011) atlanta Toyota called me reporting that there were no codes in the ecu. I repeated the code that I had read. The rep stated they would check again. Again atlanta Toyota called me, stating no codes found, and they had test driven the car and could not replicate the problem. They did replace the accelerator pedal assembly. On the drive home from the dealership I noticed that the clock time had changed about 30 minutes, and all the radio presets were gone, as if the battery had been disconnected. I inquired and the dealership rep said the battery had ‘not been touched’. My concern is this – Toyota may have reprogrammed my car due to the sudden deceleration issue, (hence the clock & radio changes), and they are not being forthcoming regarding repairs. All they will say is, there were no codes.