The outside temperature may prevent your freezer from functioning properly, especially if it is placed in a garage or somewhere outside that isn’t heated. The freezer thermostat will switch off when the ambient temperature drops below the temperature inside the appliance. In this case, your freezer unit may stop working and start defrosting.
If you think this might be the issue, relocate the appliance. To see the exact lowest ambient temperature your Beko freezer will work in, check your user manual. If you’re having trouble finding your manual, download it here using your product’s model number.