It is now 2-3 months later. The ice maker stopped functioning! (would not dispense). The ice drawer would not budge when I tried to open it, so I performed a "FD" cycle (see YouTube). Got the drawer open. Ice was all melted together and frozen hard. Dumped out the clump of ice, dried it out well, and put the drawer back.
As if that was not enough, today the unit started make this noise from behind Twin Cooling PLUS panel, which is documented at this page: "https://www.samsung.com/us/support/troubleshooting/TSG01001032/" under the topic "Fan hitting ice (and stops when door is opened)". "The noise is caused by ice buildup around the fan. You can perform a manual defrost to get rid of the ice buildup and get rid of the noise, but only service will correct the original cause."
I work from home, and this fan noise is a constant reminder of how disappointed I am with this Samsung appliance, which has been plagued by issues with the icemaker and the fan noise behind the Twin Cooling PLUS panel from early on. I have completely lost confidence in this refrigerator; I believe it has inherent design flaws that make it irreparable. (Every other refrigerator I have ever owned, mostly GE's, has worked flawlessly well beyond a ten-year average lifespan).