I am having a very intermittent problem with my 2012 Prius C i-tech At random, maybe once a week in a variety of weather conditions, it will start doing a number of things that go together, namely: 1 - Continues to rev for a second or two each time you take your foot off the accelerator - even after gentle acceleration 2 - Noisy (flat out) battery fan running 3 - Despite a full or near full battery car will not run on battery whilst it is playing up All the above lasts for about 5 to 10 minutes then it comes good again. I have called the dealer but they do not want to look at it UNLESS it is