2013 Sienna LE losing power when taking off the cruise control

Yesterday I had an issue with my 2013 Sienna when I took off the cruise control of losing power. I had the cruise on for about 35 minutes and when I took it off I kept pressing on the gas pedal and nothing happened, no acceleration nothing. I had to coast over to the side of the road and completely turn off the engine. Once I restarted it was fine. I did not use the cruise control again and once back in town I took it directly to the dealership. The dealership cannot find anything wrong with it. Does anyone know what could have happened and been the cause of losing power?