This can happen if;
1. High humidity in the air can cause excess ice and more water in self evaporating drip tray to dispurse.
2. If your rear coldplate inside fridge has iced up, check the setting you have unit on, this is the small manual thermostat located at rear, it needs a flat head screwdriver to turn Up/Down, turn to right for colder. Left to stop icing.
3. Could have small gas leak, this may show a lot of ice at one corner of the cold plate in fridge