My '08 Edge Limited AWD does shift with a bang sometimes. I've narrowed it down to when it's cold, and I pull ahead slowly, let off the gas, and then give it some gas, like entering an intersection to make a left, pausing and then accelerating. It has probably done it 20 times in 90,000 kms. Of course, it won't do it for the dealer. I'm just hoping it is a quirk, and not something serious. It's never gotten worse or increased in frequency, so fingers crossed....