So I was just up in the mountains for a week on mainly paved roads. When heading downhill for fairly long runs as I braked, the trans shifted down as I would expect, but as the road flattened out it didn't seem to want to shift back up into 4th or overdrive - even if I blipped the throttle to try and encourage it to do so. If I shifted it into manual and forced it to upshift it did so fine. Admittedly, this is a very new vehicle and I understand that most trans these days have a bit of a 'learning curve' if you will. Is this behavior normal?