Car hesitate to go after stoping

Hi, I have a 2010 Camry 2.5 just one 109000 miles. About a month ago it started hesitating after I make a complete stop at a signal or a stop sign. It do not happens each time but I would say 2 out of 5 times when I stop completely and then depress the accelerator to go it hesitates initially and then it goes. Toyota dealer couldn't find anything wrong with the car and it also passed the smog test. Any help?