Clean the condenser coils and I’m willing to bet that will fix most of them. It is absurd how often I get called out to fix a “broken” fridge/freezer only to see the condenser looking like an uncleaned drier lint trap. This includes big systems. The condenser coils for walk-in coolers/freezers and AC systems should be hosed out at least twice per year. I’ve probably spent most of the past month fixing “broken” refrigeration systems with nothing but a garden hose.