Cruise Control problems of the 2013 Honda Odyssey

I was traveling on the interstate for about 1 hour when the vehicle went into a sudden acceleration with no input from me. The speed got past 75 when I disengaged the cruise control and hit the brake. The vehicle did slow down and when I reset the cruise control, it held speed. Just before this happened by about 20 minutes, I noticed that the speed I was traveling was slowly decreasing so I "bumped" up the speed with the "acc" button on the cruise control, nothing happened. So I bumped it up a few more times with no effect. I then came to an overpass bridge and the speed slowed down to 66 going up the bridge and when over the top, rapidly accelerated to 75mph, when I got to the bottom of the bridge and on flat highway, I was still traveling at 75. So it seems that the "system" knew that I was trying to bump up the speed but didn't react until I was over the bridge. I disengaged the cruise control and reset it and it held for 20 minutes before having the sudden acceleration, feeling like it downshifted and sped up rapidly (as if I was trying to pass someone). I took the vehicle to the Honda dealership to be checked and they said that they could not replicate the problem and that no codes were in the system. I feel that the sudden acceleration is somehow related to the cruise control as well as the non-reaction to my attempt at adjusting the speed.