I had a samsung fridge. Every year it would spoil all of the food inside of it. The temperature reading on the outside would say 35 (1.5 c) but the food inside would be warm and spoiled.

It only happened when it was particularly cold outside. I eventually figured out that there is an external temperature sensor that causes the fridge to stop cooling below a certain external temperature. And that space in the kitchen was particularly cold in the back. But I could never read it below 55, so I think the sensor was faulty.

But the reading on the front is what really annoyed me. I had to keep a thermometer inside the fridge so that I didn't accidentally eat food that felt cool enough but was bad.

This happened every year. I eventually gave it away for free, with a warning to the person.