Just clarifying, his advanctrac caused him to spin out?
If so you should point him to the forum, my other advantrac thread, and Deysha.
I linked the GT500 guy's post on how he got his to fail on command on one of these advanctrac threads. If I had a manual I'd definetly give his method a shot, otherwise It's a once a month random event.
I have no idea. He just mentioned the incident to me a week ago and we chalked it up to something on the road surface. Then I saw this thread and it made me wonder.
2016 GT350, tech pack, JLT intake, Lund flex tune