Ok Im a technician. I have a wave in my shop now. I have driven this car for several hours today with no luck duplicating the concern. The customer tells me that the exact thing is happening. There are no codes, all data in the computer seems to be ok. Wondering if anyone has come accross the cause of this yet.
As for making your dealer eat shit over it, dont do that. I mean ya show that you're frustrated but technicians are paid flat rate based on the cars they repair which means that if you offer blank cheque for diagnosis they WILL find it, but most people dont want to do that. Some of these issues get very difficult for techs when they are forced to guess at what is could be when pressured to "just make a decision" by the managers and customers. It can get very expensive. Hope Im not coming off as a jerk but ive been on both sides, car owner and tech.