Model Number:
Brand: Brand
Age: Less than 1 year

Model Number: RFG297AARS
Brand: Samsung
Age: 1-5 years

I suspect a board or sensor went bad.
Background:
This initially began a month ago: A door light would surreptitiously light-up. I confirmed all the door seals work properly. With time, the stray lights became more frequent.
Then the ice-maker no longer worked properly. (It might make ice but then partially melt).
Then the door ajar alarm began to beep even if closed.
In the past few days, the freezer is no longer maintaining a proper temp.

Other times, when the faulty door lights STOP appearing and the faulty door ajar alarm beeps STOP, the Refrigerator will run and maintain a working temperature (though the Freezer does not attain the selected -6F)
I have an appliance tech coming out tomorrow, but if the issue is clearly evident that a sensor or specific board is the issue, I'd order the proper board and install myself.
TIA