Hi @cb414 ,
It could be a faulty [https://www.searspartsdirect.com/product/10kndarcjy-0046-401/id-da32-10109w|freezer temperature sensor], [https://www.searspartsdirect.com/model/1yeo50f7q6-001482/samsung-rs25j500dsg-aa-01-side-by-side-refrigerator-parts|part #1-9- freezer diagram].
Also check whether the evaporator unit ''inside the freezer compartment behind a panel'' is OK and not iced up at all and that the evaporator fan is operating OK.
The fan will stop when a door is open (either door) so you may have to listen for it operating and stopping when a door is opened and starting again when they are closed.
Usually it is controlled by the door switches but I think that your model has magnetic reed switches which aren’t that easy to find so it is a bit hard to operate them manually with a magnet with the door open.
If you can’t hear it stop and start (it will run as long as the compressor is operating and the doors are both shut) then if you can see it with the panel removed, mark one of the blades with a marker pen and then close the door and reopen it a bit later and check if the blade has moved position