Does anyone hear a high pitched whine when driving? It happens at low, medium, and high speeds but only when accelerating. It's not consistent in that it doesn't happen all the time. It's definitely tied to the power train as it always ceases when I let off the accelerator. To be certain I also turned off the climate control and entertainment system and it was still present. It's not obnoxious but is noticeable when chatting with passengers. Anyone have any experience like this? Is it normal? Or should I take it in and have it looked at?