Indicators of Transmission Issues?

[Best4x4xFAR]

Okay,

We have an '06 3.0i w/ 5 speed auto transmission. We've experienced intermittent issues with extremely hard shifts for no apparent reason, both in normal and sport modes. We are not accelerating hard, or pushing the car in anyway when it happens (in fact the shifts are harder than full on, pedal-to-the-metal sport mode shifts when they do happen).

The other issue is also intermittent, but often times after putting the car into park, and taking your foot off the brake, the vehicle moves slightly and settles on the parking pawl (as normal), but then moves yet again before settling in to a stop. It feels much like parking a manual transmission vehicle on an incline, without the parking brake, and feeling the engine 'turn over' a couple of compression strokes before holding the load.

Dealer claims (multiple visits over the ownership period) they cannot recreate either issue, and I have been unable to recreate it for them (Murphy's law I guess). The car has 84K miles on it, and I have always been concerned about the 'sealed for life' (okay, I guess they are 100K intervals now) fluid intervals for the transmission (and drive line for that matter). It is still under CPO warranty at the moment..

Any educated thoughts or similar experiences?