Your drain tube is freezing up. This can be fixed permanently by using a small copper wire to connect the heating element to the drain, for better heat conduction.
Yup, and this is what one of the class-action lawsuits is about. The problem is that on our model, that drain is behind glued-in molded styrofoam that also channels the air over the coils. It broke apart when removed. The plastic is also glued on and the fan is part of the styrofoam/plastic assembly. Samsung’s design uses just a thin Z-shaped finger of aluminum that sits in the drain, and it doesn’t do enough to prevent freezing. They made their fridges destined for landfills because they wanted to save $0.20 on thicker copper vs their lame little aluminum finger.
I didn't know there was a class action! I have the same or similar model as you. When fixing this I managed to get the Styrofoam out in two pieces and put it back well enough to cover it up again.