Originally Posted by HSV2006

Since beginning this thread, here's what I've done.
To answer a question, No - not in the sport mode at all. Just in normal Drive. Random shifts as some of you have observed. Now for what I've done.

My independent garage said my transmission showed a temperature sensor fault. I replaced the following items: the wiring harness with temperature sensor (that's the description); the 3 servos; and, the rear pulse generator. When I removed the pulse generator, the oil around it was very dirty - worse than the regular oil. Beware of the torx bolts. I had 2 to strip on me during all of this. I also pulled the front pulse generator and noticed the same bad oil. I cleaned that pulse generator.

Put everything together and added fresh fluid (I changed the previous fluid at 70k miles).

The result? ALL is well!!!!! In the combination of what I changed, it fixed it. I thought about the link over to the throttle position, but this "fix" shot down that notion.