I have an 06 Z with 21k miles on it. over the last month on the first start of the day when I turn the key it seems like there is no juice for a second and then it turns and starts. then on subsequent shut offs and starts it starts normally but if I let the car sit for an extended period of time it does it again. What could be wrong? is something failing? I don't want to take it to the dealership yet since they will have to keep it overnight to probably reproduce the problem. I live in florida.