No fridge keeps food colder then 32 degrees. It would freeze the food if it did.
Charge or restriction in the strainer.
I've been playing around with positioning the thermometer in different spots of the freezer. The top shelf gets the coldest at five degrees where the bottom shelf isn't nearly as cold at 10-15 degrees. Even though the fan appears to be running could it be not circulating well? It seems to blow ok.