2015 TLX i4 Transmission Issue (jumps into neutral)

I know that there has been a fair amount of activity reporting jerky and clunky downshifting at low speeds (which I also experience) but I have not seen anyone mention the more serious issue I have.

Every once in a while, and so far always when the engine is cold, when slowing to around 5 - 10mph to make a turn onto another street the transmission will jump into neutral so that pressing the accelerator causes the engine to rev but with no power transmitted to the wheels. I then have to take my foot off the accelerator and let the revs die down, at which time it re-engages power successfully.

I have been to the dealer a couple of times but, since it is an intermittent problem, have been unable to reproduce it on a test drive.

Obviously this is a potentially dangerous problem. Does anyone have any thoughts on what the likely cause of this behavior might be? I.e. in such a way that I could reasonably instruct the dealership to troubleshoot the issue without having to - almost impossibly - reproduce the issue?

As others have suggested, the transmission behavior in this otherwise pleasing vehicle, is not really acceptable for a car costing as much as this one does.

Thanks in advance for any insight.