I have a 3yr old Beko fridge freezer. This model has only one compressor and the thermostat is in the fridge compartement.
I am becoming concerned as the fridge seems very cold (+1, I'd expect +5) and the freezer insufficiently cold (-12, I'd expect -18). Anyone else experienced this sort of problem, as I'm at a loss to explain it?
Daughter has a fridge /freezer that has the same problem occuring about once a year. Her solution is to switch it off for 48 hours to properly defrost. (She does have a stand by freezer in the garage).
This seems to work.
The symptoms that you describe suggest that it has a lost part of the gas charge, the refrigerator section ie the evaporator will continue to get colder and freezer area will get less cold until it looses so much gas that it fails to cool at all, domestic units are not designed to be re charged and therefore uneconomical to repair