I have traded emails with Harmon Kardon support for a week. While in the end, nothing was resolved and the official answer was, "we logged this, contact us when the firmware update comes out", I have to say they were way more interested in understanding the issue, and at least trying, than Microsoft has been.
They are very sure this is a Microsoft problem so they cannot really fix. I am going to suggest that everyone with troubles here contact HK Support (Harman Kardon - Support) and fill out the 'contact us' form.
I don't expect resolution, but if enough people directly contact them, they may work harder on this. Like I said, while no answer, my extended back and forth with them somewhat restored my faith in humanity.