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Is it because it's absolutely rammed with food?
No, in theory, the fuller a fridge is the more efficient it will be.
An empty fridge will lose all the cold air inside as soon as you open the door, taking hours to get back down to temp.
A full fridge contains less air, and lots of ballast (beer, sausages and pies) that are already cold, so the fridge doesn't have to work as hard to cool down the smaller ammount of air inside that escapes upon opening the door.
Dodgy door seal or blocked drain hole maybe, so it's in overdrive all the time? Does it have a small ice/freezer compartment?
Ours did that when rammed full. A yoghurt or something had nudged the dial about 1/4 of a division and that was enough. I guess it's user error on our part but worth checking.
Mind you ours is pretty old and has to be turned down in winter as our kitchen gets really cold.
Turn the dial down a bit no need to replace the seals.
There is an air circulation that occurs inside a fridge so if it is too full and disrupts this then you can get hotter or colder spots. If the thermostat is reading warmer than other areas of the fridge it will keep cooling and you can get ice or frost forming.
blocked drain hole maybe
+1 for this. Ours does it every now and then. Usually at the back, inside towards the bottom.
Pull the fridge further away from the wall?
Its usually the blocked drain hole.. take a load of stuff out and there will be a V shaped channel in the back of the fridge (it might be behind a drawer) and a little plastic dip stick thing poking out of it... repeatedly poke the hole with your dip stick thing until a satisfactory outcome is reached
Yep, it's likely to freeze when too full.
Mattyfez is correct up until the point where you block air circulation, but is more valid for freezers. I remember my parents getting a chest freezer and then half filling it with bread 🙂