Ohh look, a same-day response from the point of sale!
They say they've upgraded the firmware (it's now at I5), and that that fixed the problem.
I already knew that to be not the case.
No word on for how long they tested it, even though I specifically asked about that because it's a periodic issue.
As I expected, they will not cancel my order
, and are referring me to Samsung if I want a replacement rather than (another) repair.
They are really racking up the points...