Appliance Repair Questions? Ask a Technician for Answers ASAP
There are a number of reasons the fridge may not be staying cold, the most common is a faulty door seal (allowing the cold to escape), the next most common fault a build up of ice hidden behind the back panel, which is stopping cool air circulating around the fridge, the third most common fault is the thermostat\temp sensor which isnt regulating the temp correctly.
Start by checking the fridge door seal, if that is making good contact all around, I would then do a 36-48 hour defrost, and see if that clears the fault, this will melt any build up of ice, if that doesnt work its most likely the thermostat which is around £30 from spares companies such as eSpares.
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