Took my 4.8 this morning for software update since I have experienced the same hesitation at low speed. Initial diagnoses by the dealer yielded nothing. They call and said that they were not able to replicate and there is nothing they can do. They asked me about the code (which I gave them earlier). An hour later, I get another call confirming that my car due for software update and they are working on it.

Two things:
1) Thanks to the original poster... very helpful post!!
2) How come they couldn't identify the software updates on their own, when later they were able once I gave them the code posted on this forum??