The gremlin is in mine... I took it into the dealer and they replaced the power seat memory module due to an intermittent grounds fault they found. I thought that fixed the issue, but NOT.
My problem is when both me and my wife are driving, we put the heaters on after the truck is running, and later find that they have switched themselves off after getting warm and then cutting out. It seems like an overload on a circuit breaker, because after we discover this, we kick them back on, and they tend to stay on.
Can't figure it out, and I will mention it again to the dealer if the truck ever needs to go back in.
MN.